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Art Nouveau Platinum and Diamond Bat Brooch: One cushion-shaped old-mine cut diamond ap. 1.40 cts., old-mine cut diamonds ap. 4.15 cts., rose-cut diamonds, c. 1905, ap. 12.2 dwts.

May 21, 2026

Art Nouveau Platinum and Diamond Bat Brooch

Est. $3,000-$5,000

$1,500

DOYLE Auctioneers & AppraisersNew York, NY

A PLATINUM AND DIAMOND NECKLACE: A PLATINUM AND DIAMOND NECKLACE A line necklace comprising round brilliant-cut diamonds; estimated total diamond weight 11.50 carats; length 17 in. Footnotes: OVERALL CONDITION: Metal partially stampe

May 19, 2026

A PLATINUM AND DIAMOND NECKLACE

Est. $5,500-$7,500

$5,500

BonhamsLos Angeles, CA

David Webb Platinum 18K Yellow Gold Diamond Bracelet 5.75 Cts: David Webb Platinum 18K Yellow Gold Diamond Bracelet 5.75 Cts This exquisite vintage bracelet by David Webb showcases a stunning combination of platinum and 18K yellow gold. Crafted with flexible rows

12 hrs Left

David Webb Platinum 18K Yellow Gold Diamond Bracelet 5.75 Cts

Est. $32,032-$41,641

$100

BidhausNew York, NY

A set of eight Moser Splendid Platinum clear cut glass tumblers, 20th century and later: A set of eight Moser Splendid Platinum clear cut glass tumblers 20th century and later Each with etched factory mark. height 4 1/2in (11.4cm)

May 21, 2026

A set of eight Moser Splendid Platinum clear cut glass tumblers, 20th century and later

Est. $400-$600

$200

Andrew Jones AuctionsLos Angeles, CA

Platinum Brooch with Sapphires and Diamonds by Oscar Heyman Circa 1960s: Platinum Brooch with Sapphires and Diamonds by Oscar Heyman Circa 1960s This Oscar Heyman brooch from the 1960s is expertly crafted in platinum and showcases 14 sapphires totaling 14.08 carats and 19

3 days Left

Platinum Brooch with Sapphires and Diamonds by Oscar Heyman Circa 1960s

Est. $44,811-$58,254

$100

BidhausNew York, NY

PLATINUM SAPPHIRE & DIAMOND NECKLACE W/GIA REPORT: Ladies' platinum sapphire (27.64ctw) and diamond (6.61ctw) necklace accompanied by an original GIA sapphire report and an AIGL appraisal report with an ERRV of $88,172.00 (See additional website image

Jun 10, 2026

PLATINUM SAPPHIRE & DIAMOND NECKLACE W/GIA REPORT

Est. $12,000-$18,000

$6,000

Dan Morphy AuctionsDenver, PA

Platinum Blue Sapphire and Diamond Floral Pendant Necklace: Platinum pendant necklace featuring a 0.96 carat pear-cut blue sapphire drop. The drop is suspended from a floral cluster bail set with four marquise-cut diamonds and one central round-cut diamond tot

1 day Left

Platinum Blue Sapphire and Diamond Floral Pendant Necklace

Est. $10-$100,000

$10

Gallery 63Atlanta, GA

Gold, Platinum, Sapphire and Colored Diamond Thistle Brooch: 8 round and oval sapphires ap. 4.45 cts., one light yellow round diamond ap. .50 ct., signed SC, ap. 16.6 dwts. The colored diamond has not been tested.Tests as 18 kt. Sapphires: medium light pastel c

May 21, 2026

Gold, Platinum, Sapphire and Colored Diamond Thistle Brooch

Est. $1,800-$2,500

$900

DOYLE Auctioneers & AppraisersNew York, NY

PLATINUM EMERALD CUT DIAMOND BRACELET: Ladies' platinum bezel-set diamond line bracelet consisting of 35 emerald cut natural diamonds with a total weight of 7.28cts, graded G/H, VS. Gross weight is 15.0 grams. Length measures 7". Width mea

Jun 10, 2026

PLATINUM EMERALD CUT DIAMOND BRACELET

Est. $8,000-$12,000

$4,000

Dan Morphy AuctionsDenver, PA

Three Stone Fancy Intense Yellow Diamond Ring Platinum and 18K Gold GIA Certified: Three Stone Fancy Intense Yellow Diamond Ring Platinum and 18K Gold GIA Certified This exquisite three-stone engagement ring features a stunning 1.32 carat Emerald Cut diamond at its center, certified

2 days Left

Three Stone Fancy Intense Yellow Diamond Ring Platinum and 18K Gold GIA Certified

Est. $11,661-$15,159

$510

Mynt AuctionsNew York, NY

PLATINUM EDWARDIAN 4CT TW DIAMOND NECKLACE: Ladies' stunning Edwardian handmade platinum and diamond pendant/brooch with fine a 14k white gold link chain, consisting of one large central bezel-set European cut natural diamond measuring approxim

Jun 10, 2026

PLATINUM EDWARDIAN 4CT TW DIAMOND NECKLACE

Est. $8,000-$15,000

$4,000

Dan Morphy AuctionsDenver, PA

David Webb 18K Yellow Gold Platinum Black Enamel Diamond Collar Necklace: David Webb 18K Yellow Gold Platinum Black Enamel Diamond Collar Necklace This stunning David Webb collar necklace is crafted from a combination of Platinum and 18K Yellow Gold, showcasing a luxurious

6 hrs Left

David Webb 18K Yellow Gold Platinum Black Enamel Diamond Collar Necklace

Est. $45,968-$59,758

$100

Mynt AuctionsNew York, NY

Art Deco Platinum Bracelet 12.00 Ct Old Mine Diamonds F-I VS1-SI1: Art Deco Platinum Bracelet 12.00 Ct Old Mine Diamonds F-I VS1-SI1 This stunning Art Deco bracelet is crafted in platinum and features a remarkable total diamond weight of approximately 12.00 carats. T

1 day Left

Art Deco Platinum Bracelet 12.00 Ct Old Mine Diamonds F-I VS1-SI1

Est. $16,276-$21,158

$100

Mynt AuctionsNew York, NY

Antique Art Deco Cocktail Ring Platinum 2.51ctw Sapphire Diamond: Antique Art Deco Cocktail Ring Platinum 2.51ctw Sapphire Diamond This stunning Antique Art Deco Cocktail Ring showcases a beautiful combination of sapphires and diamonds, set in solid platinum with wh

6 hrs Left

Antique Art Deco Cocktail Ring Platinum 2.51ctw Sapphire Diamond

Est. $4,342-$5,644

$100

Mynt AuctionsNew York, NY

A set of six Moser Splendid Platinum clear cut glass wine goblets, 20th century and later: A set of six Moser Splendid Platinum clear cut glass wine goblets 20th century and later Each with etched factory mark. height 7 3/4in (19.7cm)

May 21, 2026

A set of six Moser Splendid Platinum clear cut glass wine goblets, 20th century and later

Est. $400-$600

$200

Andrew Jones AuctionsLos Angeles, CA

Platinum, Pink Sapphire, and Diamond Cluster Ring: Platinum cluster ring featuring a four-prong set oval natural pink sapphire surrounded by a tiered halo of round brilliant-cut diamonds. The band is crafted from Pt900 platinum and features decorative

1 day Left

Platinum, Pink Sapphire, and Diamond Cluster Ring

Est. $10-$100,000

$10

Gallery 63Atlanta, GA

Platinum Necklace With 9.55 Carat Old European Cut Diamonds: Platinum Necklace With 9.55 Carat Old European Cut Diamonds This platinum Diamonds by the Yard necklace features 15 old European cut diamonds, each averaging approximately 0.64 carats, for a total dia

4 days Left

Platinum Necklace With 9.55 Carat Old European Cut Diamonds

Est. $11,791-$15,328

$100

BidhausNew York, NY

Art Deco Platinum Diamond Ladies Watch: Art Deco Platinum Diamond Ladies Watch Early 20th Cent. Art deco platinum ladies watch, featuring a rectangular case and silvered dial with black Arabic numerals. The case is finely engraved and frame

May 21, 2026

Art Deco Platinum Diamond Ladies Watch

Est. $1,000-$1,500

$550

Akiba GalleriesDania Beach, FL

Art Deco Platinum Convertible Diamond Necklace or Two Bracelets 15.5 Inch: Art Deco Platinum Convertible Diamond Necklace or Two Bracelets 15.5 Inch This Art Deco platinum piece features a versatile design that can be worn as a necklace or separated into two bracelets. The p

May 19, 2026

Art Deco Platinum Convertible Diamond Necklace or Two Bracelets 15.5 Inch

Est. $73,476-$95,518

$100

BidhausNew York, NY

A set of eight Moser Splendid Platinum clear cut glass flutes, 20th century and later: A set of eight Moser Splendid Platinum clear cut glass flutes 20th century and later Each with etched factory mark. height 8in (20.3cm)

May 21, 2026

A set of eight Moser Splendid Platinum clear cut glass flutes, 20th century and later

Est. $600-$800

$300

Andrew Jones AuctionsLos Angeles, CA

Antique Art Deco Platinum Engagement Ring GIA 1.32ct Diamond: Antique Art Deco Platinum Engagement Ring GIA 1.32ct Diamond This exquisite Antique Art Deco engagement ring features a stunning 1.32ctw of old cut diamonds set in solid .900 platinum. The centerpiece

2 days Left

Antique Art Deco Platinum Engagement Ring GIA 1.32ct Diamond

Est. $4,862-$6,320

$100

Mynt AuctionsNew York, NY

Luxurious Platinum 18K White Gold 13.00 Ct Diamond Earrings: Luxurious Platinum 18K White Gold 13.00 Ct Diamond Earrings These stunning earrings feature a luxurious combination of platinum and 18K white gold. Each earring showcases approximately 13.00 carats of

3 days Left

Luxurious Platinum 18K White Gold 13.00 Ct Diamond Earrings

Est. $18,993-$24,690

$100

Mynt AuctionsNew York, NY

Art Deco Platinum Ring with 2.82 Ct Lab Grown Diamond and 22 Side Diamonds: Art Deco Platinum Ring with 2.82 Ct Lab Grown Diamond and 22 Side Diamonds This exquisite Art Deco ring is crafted in platinum and features a stunning 2.82 Ct. round lab-grown diamond at its center. T

1 day Left

Art Deco Platinum Ring with 2.82 Ct Lab Grown Diamond and 22 Side Diamonds

Est. $6,773-$8,804

$100

Mynt AuctionsNew York, NY

A FIVE-PIECE PLATINUM, 14K GOLD, DIAMOND, AND MOTHER OF PEARL TUXEDO CUFFLINKS AND STUD SET, 20TH: A FIVE-PIECE PLATINUM, 14K GOLD, DIAMOND, AND MOTHER OF PEARL TUXEDO CUFFLINKS AND STUD SET, 20TH CENTURY, platinum set with mother of pearl and diamonds (2 mm), and with 14k yellow gold backings, mar

4 days Left

A FIVE-PIECE PLATINUM, 14K GOLD, DIAMOND, AND MOTHER OF PEARL TUXEDO CUFFLINKS AND STUD SET, 20TH

Est. $1,200-$1,600

$600

Simpson Galleries, LLCHouston, TX

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