18 kt gold earrings sapphire

18 kt. White gold - Earrings Sapphire - Diamond, Sapphire

18 kt. White gold - Earrings Sapphire - Diamond, Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Diamond earrings with 18 kt gold and pink sapphires.Excellent condition – brand new.Solid 18 kt () white gold.2 pink sapphires per earring.1 sapphire of 4.5 mm, 0.45 ct: brilliant cut.1 sapphire of 3.5 mm, 0.16 ct: brilliant cut.4 sapphires, total carat weight for the 2 earrings: 1.22 ct.56 diamonds of approx. 1.3 mm each.A total of 0.55 ct in brilliant cut diamonds for the two earrings.28 diamonds per earring.Clarity: VVS.Colour: H.The stones are of excellent quality and were tested, proving that these are natural stones.Length of the earrings: 18.5 mm.A width of 5 mm ascending to 6 mm.Total weight (grams): 3.5.Registered shipping with tracking number. Read more

18 kt. Gold - Earrings Sapphire

18 kt. Gold - Earrings Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Long earrings made in yellow gold of kt) with panther chain and oval cut sapphires of 1 ct Push back clasp - In mint condition.* This piece of jewellery has been tested to confirm that it is 18 kt gold. The hallmark is on the earring clasp.- Weight: 5.00 g (approx.)- Earring height: mm (approx.).- Clasp type: push back- Clasp material: 18 kt () yellow gold.- Condition: in mint condition- Sapphires.- Sapphires total number: 2- Sapphire cut: oval- Total carat weight of the sapphires: 1.00 ct- Precious stones are commonly treated to improve their colour or clarity. The gemstone set in this specific piece of jewellery has not been verified in this respect.Shipping costs: registered with tracking codeIf you wish to know more about our products, please click on the following link:https://auction.catawiki.com/lotsfrom/RamacriREF: 30.F035Code: SR10-IJAThis item may be subject to customs duties Read more

Related products 18 kt gold earrings sapphire: 18 kt. Gold - Earrings Sapphire
18 kt. Gold - Earrings Sapphire - Amethyst

18 kt. Gold - Earrings Sapphire - Amethyst

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. 18 kt yellow gold earrings with blue and yellow sapphires. Total carat weight: 1.5 ct. With two 5 ct amethysts.Earring length: 13 mm.Total weight: 4.90 g.Held by prongs. Read more

18 kt. Gold - Earrings Tourmaline - Sapphire

18 kt. Gold - Earrings Tourmaline - Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. This superb pair of early 's Luxury Antique earrings are comprised of 2 oval cut Red Tourmaline stones measuring 6mm x 4.5mm each (total carat weight +/-1.20ct) surrounded by 20 round cut white sapphires set on handmade 18karat Gold Weight in grams: 3.24grHandmade 18K Yellow Gold (This item has also been tested to confirm gold finesse)Size of Earrings: Fronts measure 10mm x 8.5mm and they extend 15mm to the backExcellent Condition - (Please see photos!)**Fast & Secure Registered Worldwide Shipping**All our items accurate expertise guaranteed by our team of experts with over 20 years of experience providing evaluations of Diamond/ Precious stones qualities.(Gemstones are sometimes treated to enhance color or clarity. We have not researched more details for this item.)Checkout our other active luxury items by clicking on username "avrinet". And, If you buy more than one of our items we will be glad to send the items together to save on shipping. Items can also be picked up from our shop in Brussels. Please contact us via catawiki message platform to make arrangements. eb Read more

Related products 18 kt gold earrings sapphire: 18 kt. Gold - Earrings Tourmaline - Sapphire
18 kt. Gold - Earrings Sapphire - Amethyst

18 kt. Gold - Earrings Sapphire - Amethyst

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. 18 kt yellow gold earrings with blue sapphire of excellent clarity weighing 2 ct (such stones are usually treated, this lot has not been examined in that regard) and amethyst, earring length 18 mm, width 15 mm, total weight 5.7 g, in prong setting.Precious stones are often treated to intensify their colour or clarity. The item in question has not been tested in this regard. Read more

18 kt. Gold - Earrings Diamond - Sapphire

18 kt. Gold - Earrings Diamond - Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. White gold earrings with oval cut faceted sapphires, approx. 0.50 ct, and brilliant cut diamonds, colour H, clarity VS, for a total weight of 0.55 ct.Insured and tracked shipping. Read more

Related products 18 kt gold earrings sapphire: 18 kt. Gold - Earrings Diamond - Sapphire
18 kt. Gold - Earrings Sapphire - Diamond

18 kt. Gold - Earrings Sapphire - Diamond

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Earrings in kt) yellow gold with centre of oval sapphire of 6 ct. in prongs, and an edge of brilliant cut diamonds of 1.70 ct Push back clasp - In mint condition.-* This piece of jewellery has been tested and confirmed to be made of 18 kt gold.- Weight: 9.50 g (approx.)- Earring material: kt) yellow gold.- Measurements of the earrings: Height mm x width mm x thickness 8 mm (approx) - All indicated measurements are approximate.- Diamonds: brilliant cut- Total number of diamonds: 32- Total diamond weight: 1.70 ct- Diamonds: baguette cut.- Colour: H-I.- Clarity: VS-SI- Central sapphire: oval cut- Sapphires total number: 2- Sapphires total carat weight: 6 ct.- Precious stones are commonly treated to enhance their colour or clarity. The gemstones set in this specific piece of jewellery have not been verified in this respect.- Condition: mint conditionShipping costs: registered with tracking codeIf you wish to know more about our products, please click on the following link:https://auction.catawiki.com/lotsfrom/CastellanohermanosSL REF.: CODE: R500- HPAAThis item may be subject to customs charges. Read more

18 kt. Gold - Earrings - 1.20 ct Diamond - Sapphire

18 kt. Gold - Earrings - 1.20 ct Diamond - Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. 24 Brilliant cut diamonds of 0.05 ct (1.20 ct), colour G, clarity VS. Two oval cut sapphires of 0.75 ct (1.50 ct)‘Precious stones are commonly treated to improve their colour or clarity. The item in question has not been tested in this regard.The gold quality has been verified and hallmarked by a professional. The jewellery will be safely shipped via courier service with insurance within 24 hours after payment. Checked and examined by a professional. Read more

Related products 18 kt gold earrings sapphire: 18 kt. Gold - Earrings - 1.20 ct Diamond - Sapphire
18 kt. Gold - Earrings - 0.05 ct Sapphire - Diamond

18 kt. Gold - Earrings - 0.05 ct Sapphire - Diamond

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. earrings in 18kt gold, total weight 2.60g2 sapphires, oval cut, total 0.05 ct2 Diamonds, brilliant cut, total 0.02 ct, G-H color, VS2-SI1 clarity.Punched "AR".Gems are commonly treated to improve their color and purity, this has not been researched for this particular object.the jewel is accompanied by a jewelry report drawn up by an expert gemologist from the Agrigento court.Shipping via international courier. Customs fees charged to the buyer. intercontinental shipping may take business days Read more

18 kt. Gold - Earrings - 1.30 ct Sapphire - Diamond

18 kt. Gold - Earrings - 1.30 ct Sapphire - Diamond

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. These elegant vintage Victorian inspired earrings feature 1,30ct Sapphires surrounded by Old Mine Cut Diamonds in Gold.Dimensions: 15 x 10 mm (front)Weight in grams: 4,00Condition: Good condition - used with some signs of wearRef: GMRegistered Shipping or Local Pickup at our store (in the case of Local Pickup shipping cost will be refunded).For delivery outside of the European Union, you may incur import duties and taxes which are levied once the package has reached the destination country. Please allow 5 to 10 days to receive your order.Mounted stone(s) is/are graded only insofar as mounting permits observation.Most colored gemstones (i.e. rubies, sapphires, and emeralds) are commonly treated to enhance color or clarity. This has not been researched for this specific item.Please check out our other active auctions by clicking on Seller "Binenbaum Antiques & Jewelry". Read more

Related products 18 kt gold earrings sapphire: 18 kt. Gold - Earrings - 1.30 ct Sapphire - Diamond
18 kt. Gold - Earrings - 0.55 ct Diamond - Sapphire

18 kt. Gold - Earrings - 0.55 ct Diamond - Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Offered in new condition: rose gold dangling ear studs with 12 pieces of brilliant cut diamonds on the front. Total weight approx. 0.55 ct, G/VVS, and two beautiful sapphires of approx. 0.70 ct in total. The earrings are equipped with a safety clasp. Natural diamonds – approx. 0.55 ct, G/VVS.2 pieces of sapphire – 0.70 ct (2x 0.35), treatment unknown. Length: 1.9 cm. Gold grade: 18 kt (engraved with 750). Weight: 3.1 g. Condition: new. Shipping: Insured shipping by UPS within the Netherlands. Insured shipping by UPS outside of the Netherlands. Read more

18 kt. White gold - Earrings - 0.50 ct Diamond - Sapphire

18 kt. White gold - Earrings - 0.50 ct Diamond - Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. the size of the earring is 2.1 cm long by 9.2 mm wideweight 3.6 gramsset with-2 x 7.0 mm x 5.0 mm oval facet cut heated sapphire total circa 1.55 approximateColor BluePurity SIGemstones are often treated to improve color or brightness. This has not been investigated for this particular item. '- 28 x 1.7 mm brilliant cut diamond total approximately 0.50 caratcolor D-FPurity VS/SIearrings are in good conditionhallmark present, guaranteed and tested on 18k goldIs sent by registered mail and insuredin the Netherlands with a mikrop packageOutside the Netherlands with Fedexbuyers outside the EU must take into account VAT and import duties they have to payS/FS Read more

Related products 18 kt gold earrings sapphire: 18 kt. White gold - Earrings - 0.50 ct Diamond - Sapphire
18 kt. White gold - Earrings - 0.81 ct Sapphire - Diamond

18 kt. White gold - Earrings - 0.81 ct Sapphire - Diamond

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. - 18K Ladies Earrings - White Gold 18K grams - Earring Size 15 x 7 x 4 mm - Natural Sapphire 0.81 ct Yellowish Greenish Blue (Heated)- Brilliant cut Diamonds 0.34 ct H-I VS-SI - Gemstones are commonly treated to enhance color or clarity- Made in Belgium - See Certificate and photo's for more details. - Shipping by registered post with insurance. *** No Reserve *** Read more

18 kt. White gold - Earrings - 0.52 ct Diamond - Sapphire

18 kt. White gold - Earrings - 0.52 ct Diamond - Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. the top of the ear bud is in an oval shape of 1.1 cm by 9.5 mm wideweight 4.3 gramsset with- 2 x 7.0 mm x 5.0 mm oval facet cut heated sapphire total approximately 1.64 caratColor BluePurity SIGemstones are often treated to improve color or brightness. This has not been investigated for this particular item. '- 28 x 1.6 mm brilliant cut diamond total approximately 0.52 caratcolor D-Fpurity VS-SIEar buds are in new conditionIs sent by registered mail and insuredin the Netherlands with a mikrop packageOutside the Netherlands with Fedexbuyers outside the EU must take into account VAT and import duties they have to payS Read more

Related products 18 kt gold earrings sapphire: 18 kt. White gold - Earrings - 0.52 ct Diamond - Sapphire
18 kt. White gold - Earrings - 0.52 ct Diamond - Sapphire

18 kt. White gold - Earrings - 0.52 ct Diamond - Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. The top of the ear studs have an oval shape of 1.1 cm by 9.5 mm wide. Weight: 4.3 grams. Set with: - 2 x 7.0 mm x 5.0 mm oval faceted cut heated sapphire, approx. 1.64 ct in total Colour: blue Clarity: SI. Gemstones are often treated to enhance colour or clarity. This has not been checked for this specific object. - 28 x 1.6 mm brilliant cut diamond, approx. 0.52 ct in total Colour: D–F Clarity: VS-SI. Ear studs are in new condition. Will be sent by registered and insured mail, within the Netherlands by Mikropakket, abroad by FedEx. Buyers from outside the EU should take into account VAT and import duties that they have to pay. S Read more

18 kt. Gold - Sapphire Ring - 750 Gold - Sapphire + Diamonds

18 kt. Gold - Sapphire Ring - 750 Gold - Sapphire + Diamonds

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Sapphire ring - 750 yellow gold - sapphire and diamondsOn offer is a beautiful and high-quality women's ring. It is made of yellow gold, a light blue sapphire with a weight of 1.00 ct and 14 small diamonds 0.14 ct in total, see images This ring is characterised by its quality and a nice finish.The ring has an extraordinary design, which gives the ring a sensational look, see pictures. The ring is used. Ring details: Material: yellow goldAlloy: 18 kt - 750Ring size: 63Ring weight: gGemstones: 1 sapphire of 1.00 ct and 14 diamonds totalling 0.14 ct Diamonds: - Colour: H - Cut: brilliant - Clarity: VS1Condition: usedShipped via DHL Read more

Related products 18 kt gold earrings sapphire: 18 kt. Gold - Sapphire Ring - 750 Gold - Sapphire + Diamonds
Blue Sapphire- 18 kt. Gold - Ring Sapphire - Diamond

Blue Sapphire- 18 kt. Gold - Ring Sapphire - Diamond

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. 18ct yellow gold with a platinum mount Victorian style ring MeasurementsSize: UK NSetting Width: 12mm (approx.)Weight: 3.96 grams Hallmark:Full Birmingham hallmark for 18-carat golddiamond: old cut G-H colour clarity: VSSapphire: Blue sapphire item will post to you with a tracking number to keep a track about your item.and please bid genuine buyers only. Read more

14 kt. Gold - Earrings Sapphire

14 kt. Gold - Earrings Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. pair of earringsoval shape crafted set in yellow gold marked 14 kt on the side of the earring Mint condition – As new Items will be sent tracked and signed for, once paid and takes 14 days to reach europe Read more

Related products 18 kt gold earrings sapphire: 14 kt. Gold - Earrings Sapphire
14 kt. Bicolour, Gold, White gold - Earrings Sapphire

14 kt. Bicolour, Gold, White gold - Earrings Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Earrings made of 14 kt yellow-/white gold each faceted with a sapphire navette hallmarkedMint condition (refurbished)Length: approx. 4.2 cmWeight 3.84 g.The earrings are shipped insured in a gift box free of charge withinGermany.See under shipment for other countries. Read more

14 kt. Pink gold - Earrings Sapphire

14 kt. Pink gold - Earrings Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Handmade earrings, with mirror set sapphires, recently cleaned. Condition: very good, used, minor signs of wear as shown. Hallmarks: 14 kt gold, as shown.Metal: 14 kt rose gold. Dimensions: 3.38 x 1.35 cm Weight: 3.80 g  no. 12 natural sapphires of 7.38 ct, pear cut, light blue colourPackaged in a case. Shipment via registered mail. Read more

Related products 18 kt gold earrings sapphire: 14 kt. Pink gold - Earrings Sapphire
14 kt. Bicolour, Gold - Earrings Sapphire - Diamond

14 kt. Bicolour, Gold - Earrings Sapphire - Diamond

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Geelgouden dames oorstekers bezet met een saffier en 28 x diamanten van ieder ct.Gezet in een witgouden zetting.Dit sieraad is door onze expert getoetst op goudgehalte en echt bevonden.Specificatie diamant: Slijpvorm: Single cutGrootte: 28 x ct.Zuiverheid: vsKleur: gKwaliteit: Tweedehands en in zeer goede staat. Voor eigen indruk, zie foto’s. Kavelnummer Aangetekende verzending. U kunt het kavel ook afhalen in onze showroom te KlaaswaalDeze aanbieder heeft wekelijks +/- 500 veilingitems. Bekijk het aanbod: https://veiling.catawiki.nl/aanbod/verzamelaarsveiling Read more

18 kt. Gold - Ring Sapphire

18 kt. Gold - Ring Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Gold 18 kt Very fine cocktail ring in gold with 2 sapphires in different colour tones of 0.80 ct in total. Precious stones are commonly treated to improve their colour or clarity. The gemstones set in this specific piece of jewellery have not been verified in this respect. Shipping costs to be paid by the buyerDelivery via courier serviceMoney-back guaranteeref store lo560 Read more

Related products 18 kt gold earrings sapphire: 18 kt. Gold - Ring Sapphire
18 kt. Gold - Ring Sapphire

18 kt. Gold - Ring Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Bespoke ring mounted in shape of 9 or 6 (depending on how it is worn) in 18 kt white gold. Comprising 23 brilliant-cut diamonds for a total of 3.10 ct.With a sapphire of 2.90 ct. A total of 6 ct for the 2 types of stones. Ring band size 62 circumference and diameter 20 mm.Ring measurements: 30 mm x 20 mmWeight: 18 gBrilliants: 4 Cut: brilliantClarity: VS2 / S I Colour: H / ICarats: 3.10 ctOval-cut sapphire, 10 mm x 6 mm, 2.90 ct.Information on the coloured stones: since most coloured stones are treated, no special research has been done on these ones.Shipping by Bpost international with tracking and insurance. Read more

18 kt. Gold - Necklace Sapphire

18 kt. Gold - Necklace Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Rigid necklace in bicolour gold with two hollow pipes which are finished with an oval cut in the centre in which two sapphires and two cabochon cut emeralds are set. Moulded to the shape of a neck so it fits perfectly. To put it on, you open it out in two parts which have spring hinges.The total weight of the two sapphires is 1.71 ctThe total weight of the two emeralds is 1.14 ctTotal gold weight: gHallmark: MI Read more

Related products 18 kt gold earrings sapphire: 18 kt. Gold - Necklace Sapphire
18 kt. Gold - Necklace Sapphire

18 kt. Gold - Necklace Sapphire

Are you interested in this item?This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. 18k/750 yellow gold necklace with grey sapphire.Item details:Necklace in mint condition.750 stamped on the clasp. Spring ring measurement, 6 mm. ØLength: 49 cm. Weight: 5.6 g. Stones:7 briolette-shaped sapphires arranged by size.Measures from 8.6 mm. x 5.6 mm. Ø to 9 mm. x 6.2 mm. ØThis type of gemstone is commonly treated to enhance color. This fact has not been examined for this specific stone Shipping:DHL insured shippingTransit time:Europe: 24h to 48h.Worldwide 48h to 72h.Ref: J790 Read more

Contact