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Platinum 10.85ct Amethyst and Diamond Cabochon Bypass Pendant: A contemporary platinum pendant featuring a large oval cabochon amethyst held in a four-prong setting. The central amethyst displays a deep, saturated purple color. The stone is nestled within a fluid

Jun 10, 2026

Platinum 10.85ct Amethyst and Diamond Cabochon Bypass Pendant

Est. $10-$100,000

$10

Gallery 63Atlanta, GA

Cushion Cut 2.31ct Fancy Intense Yellow Diamond Ring GIA Platinum 18K Gold: Cushion Cut 2.31ct Fancy Intense Yellow Diamond Ring GIA Platinum 18K Gold This exquisite ring features a stunning 2.31 carat cushion cut diamond with a fancy intense yellow hue, certified by GIA. The

May 23, 2026

Cushion Cut 2.31ct Fancy Intense Yellow Diamond Ring GIA Platinum 18K Gold

Est. $23,270-$30,251

$100

BidhausNew York, NY

ART DECO PLATINUM 5.0 CT. TW. DIAMOND BRACELET.: An Art Deco, platinum (tested), hand-crafted, bracelet set with approx. 4.5 - 5.0 ct. tw., Old European, round brilliant and single cut, natural diamonds of G-H-I color and VS-SI clarity, 14mm wide, 7

May 27, 2026

ART DECO PLATINUM 5.0 CT. TW. DIAMOND BRACELET.

Est. $3,000-$5,000

$1,500

William Smith AuctionsPlainfield , NH

EGL Certified Platinum Two-Stone Diamond Ring 5.04 Ct Trillion 3.96 Ct Champagne: EGL Certified Platinum Two-Stone Diamond Ring 5.04 Ct Trillion 3.96 Ct Champagne This exquisite platinum ring features an EGL Certified two-stone design, showcasing a stunning 5.04 Ct trillion diamond

Jun 01, 2026

EGL Certified Platinum Two-Stone Diamond Ring 5.04 Ct Trillion 3.96 Ct Champagne

Est. $45,617-$59,302

$100

Mynt AuctionsNew York, NY

PLATINUM LADIES RING W/ DIAMONDS & OPAL W/ GIA: One electronically tested platinum ladies cast opal and diamond ring with a bright polish finish. ;The featured opal is set within a diamond bezel supported by diamond set split shoulders, completed b

May 30, 2026

PLATINUM LADIES RING W/ DIAMONDS & OPAL W/ GIA

Est. $2,450-$10,000

$600

Florida Estate Sales Inc.Tallahassee, FL

Platinum Sapphire and Diamond Ring with GIA Report: An elegant platinum ring set with a striking oval-cut blue sapphire at center, surrounded by a halo of round brilliant cut diamonds and additional diamonds extending along the split shoulders. The viv

Jun 06, 2026

Platinum Sapphire and Diamond Ring with GIA Report

Est. $2,500-$3,500

$1,500

Williamson Auction GalleryHollywood, FL

PLATINUM & 18K GOLD 7CT DIAMOND RING W/GIA REPORT: Ladies' platinum and 18k gold yellow diamond (7.00ct, Y/Z, VS2) and white diamond (1.87ctw) ring accompanied by an original GIA natural diamond grading report (See additional website images of report

Jun 10, 2026

PLATINUM & 18K GOLD 7CT DIAMOND RING W/GIA REPORT

Est. $50,000-$80,000

$26,000

Dan Morphy AuctionsDenver, PA

Platinum and Round Brilliant Cut Diamond Cross Pendant: This platinum pendant is designed in the form of a Latin cross and is set with eleven round brilliant-cut diamonds. The diamonds are individually held in four-prong settings, each surrounded by a deco

Jun 10, 2026

Platinum and Round Brilliant Cut Diamond Cross Pendant

Est. $10-$100,000

$10

Gallery 63Atlanta, GA

Art Deco Platinum Brooch 7.95 Ct Diamonds H-I VVS Clarity 1.75 inches: Art Deco Platinum Brooch 7.95 Ct Diamonds H-I VVS Clarity 1.75 inches This exquisite Art Deco brooch features a stunning arrangement of diamonds totaling 7.95 carats. Crafted in platinum, the centerpi

Jun 02, 2026

Art Deco Platinum Brooch 7.95 Ct Diamonds H-I VVS Clarity 1.75 inches

Est. $9,490-$12,337

$100

Mynt AuctionsNew York, NY

Harbor Diamonds Emerald Cut Diamond Wedding Band 7.41 Carats Platinum: Harbor Diamonds Emerald Cut Diamond Wedding Band 7.41 Carats Platinum This exquisite Emerald Cut Diamond Wedding Band features a stunning total weight of 7.41 carats, beautifully crafted in luxurious

May 24, 2026

Harbor Diamonds Emerald Cut Diamond Wedding Band 7.41 Carats Platinum

Est. $35,217-$45,782

$27,000

Mynt AuctionsNew York, NY

Platinum Natural Black Opal and Diamond Cocktail Ring: Platinum cocktail ring featuring a natural black opal center stone and a halo of natural diamonds. The oval cabochon opal is secured by four prongs within a tiered, scalloped diamond halo, flanked by

Jun 03, 2026

Platinum Natural Black Opal and Diamond Cocktail Ring

Est. $10-$100,000

$20

Gallery 63Atlanta, GA

ART DECO PLATINUM OLD MINE DIAMOND ENGAGEMENT RING.: An Art Deco, platinum (stamped, faded), engagement ring set with a GIA certified, 2.43 ct., Old Mine brilliant cut, natural diamond of H color and SI2 clarity with approx. .80 ct. tw., trapezoid and b

May 27, 2026

ART DECO PLATINUM OLD MINE DIAMOND ENGAGEMENT RING.

Est. $10,000-$15,000

$5,000

William Smith AuctionsPlainfield , NH

Oversized Dome Estate Ring in Platinum Gold and White Enamel by David Webb: Oversized Dome Estate Ring in Platinum Gold and White Enamel by David Webb This David Webb oversized dome ring features a bold checkerboard-inspired design crafted from 18K yellow gold and platinum. T

May 31, 2026

Oversized Dome Estate Ring in Platinum Gold and White Enamel by David Webb

Est. $25,246-$32,819

$100

Mynt AuctionsNew York, NY

ANTIQUE PLATINUM OLD MINE CUT DIAMOND CRESCENT PIN.: An antique, platinum (tested) and 18k yellow gold (tested), crescent pin set with approx. 3.5 ct. tw., Old Mine cut, natural diamonds of G-H-I color and VS-SI clarity, 3 5/8 inches long, 11.4 grams. T

May 27, 2026

ANTIQUE PLATINUM OLD MINE CUT DIAMOND CRESCENT PIN.

Est. $2,000-$2,500

$1,000

William Smith AuctionsPlainfield , NH

Three Carre Cut F VS1 Diamonds Platinum Channel Band Ring 1.04ct Size 6.5: Three Carre Cut F VS1 Diamonds Platinum Channel Band Ring 1.04ct Size 6.5 This platinum band ring features three natural, genuine carre (square step cut) diamonds in a channel setting. The diamonds ha

Jun 04, 2026

Three Carre Cut F VS1 Diamonds Platinum Channel Band Ring 1.04ct Size 6.5

Est. $2,769-$3,599

$100

Mynt AuctionsNew York, NY

6.00ct Orange Pink Oval Tourmaline and 0.21ctw Diamond Platinum Necklace: This necklace features an oval-faceted orange-pink tourmaline set within a platinum pendant. The central gemstone is secured by four prongs and is surrounded by a halo of round-cut diamonds. The penda

May 24, 2026

6.00ct Orange Pink Oval Tourmaline and 0.21ctw Diamond Platinum Necklace

Est. $2,000-$3,000

$200

Lion and UnicornHollywood, FL

Art Deco Platinum Ring with Rose Cut Diamonds 1.20 Inch Long Size 8.25: Art Deco Platinum Ring with Rose Cut Diamonds 1.20 Inch Long Size 8.25 This exquisite Art Deco ring is crafted from platinum and features a striking elongated shape measuring 1.20 inches in length wit

May 30, 2026

Art Deco Platinum Ring with Rose Cut Diamonds 1.20 Inch Long Size 8.25

Est. $3,328-$4,326

$100

Mynt AuctionsNew York, NY

PLATINUM 9.86 CT. TW. RBC DIAMOND TENNIS BRACELET.: A platinum (stamped) tennis bracelet set with stated to be 9.86 ct. tw., round brilliant cut, natural diamonds of H-I color and VS-SI clarity, approx. .28 ct. each or 4mm, 7 5/16 inches long, 25.7 gra

May 27, 2026

PLATINUM 9.86 CT. TW. RBC DIAMOND TENNIS BRACELET.

Est. $7,000-$10,000

$3,500

William Smith AuctionsPlainfield , NH

PLATINUM 2.15 CT. TW. EMERALD CUT DIAMOND BAND.: A platinum (stamped) seven stone band set with 2.15 ct. tw., emerald cut, natural diamonds of H-I color and VS clarity. Ring size 6 3/4, 6.3 mm wide, 7.5 grams. Tested as natural mined diamonds.

May 27, 2026

PLATINUM 2.15 CT. TW. EMERALD CUT DIAMOND BAND.

Est. $2,000-$3,000

$1,000

William Smith AuctionsPlainfield , NH

Art Deco Platinum Ruby Eternity Band GIA Burma No Heat Ring Size 7: Art Deco Platinum Ruby Eternity Band GIA Burma No Heat Ring Size 7 This antique Art Deco eternity band features a continuous row of natural, square step-cut rubies set in solid platinum. The rubies, s

May 31, 2026

Art Deco Platinum Ruby Eternity Band GIA Burma No Heat Ring Size 7

Est. $3,796-$4,934

$100

Mynt AuctionsNew York, NY

Art Deco Platinum Pin 7.50 Ct Old Mine Diamonds G-J VS1-SI1: Art Deco Platinum Pin 7.50 Ct Old Mine Diamonds G-J VS1-SI1 This exquisite Art Deco pin is crafted from platinum and features a stunning total of 7.50 carats of Old Mine Diamonds. The centerpiece incl

Jun 04, 2026

Art Deco Platinum Pin 7.50 Ct Old Mine Diamonds G-J VS1-SI1

Est. $8,125-$10,562

$100

Mynt AuctionsNew York, NY

Unheated Pink Sapphire and Diamond Ring, GIA Certified Platinum: Modern toi et moi ring crafted in white metal, featuring a striking pairing of a natural pink sapphire and a round brilliant-cut diamond in a clean bezel setting. The asymmetrical design highlights th

6 days Left

Unheated Pink Sapphire and Diamond Ring, GIA Certified Platinum

Est. $4,000-$8,000

$1,500

Williamson Auction GalleryHollywood, FL

Platinum, Carved Sapphire, Ruby and Diamond Leaf Clip-Brooch: One carved sapphire leaf ap. 29.08 x 16.51 x 4.75 mm., 17 round diamonds ap. 1.05 cts., single-cut diamonds, rectangular and fancy-shaped rubies, ap. 14.5 dwts. With GIA report no. 6233851908 stating

6 days Left

Platinum, Carved Sapphire, Ruby and Diamond Leaf Clip-Brooch

Est. $2,000-$3,000

$1,000

DOYLE Auctioneers & AppraisersNew York, NY

Platinum, Angel Skin Coral Cameo and Diamond Pendant-Brooch: One oval coral cameo ap. 41.0 x 33.0 mm., old European and single-cut diamonds ap. 1.75 cts., c. 1910, ap. 25.3 dwts. gross.

6 days Left

Platinum, Angel Skin Coral Cameo and Diamond Pendant-Brooch

Est. $1,500-$2,000

$800

DOYLE Auctioneers & AppraisersNew York, NY

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