Onyx

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Malachite & Black Onyx 925 Necklace & Pin: Vintage sterling Malachite and Black Onyx necklace, 18" long. Vintage sterling malachite brooch is 1.5" wide. (9 dwt)

2026

Malachite & Black Onyx 925 Necklace & Pin

Vintage AuctionsOttawa, OH

7 Sterling Rings with Marcasite & Other Gems: Seven sterling rings with marcasite, blue topaz, garnet & black onyx. Sizes 6-9 (21 dwt) (6x4x2)

2026

7 Sterling Rings with Marcasite & Other Gems

Vintage AuctionsOttawa, OH

A Vitorian Brooch: Victorian period, black onyx, set with seed pearls and a central marquise-shaped lapis lazuli, length 45 mm.

2026

A Vitorian Brooch

Veilinghuis de JagerGoes, Zeeland

12.70 Ct Natural Orange Onyx Trillion Cut: Weight - 12.70 Ct / Dimensions - 18.10 x 17.90 x 7.10 mm / Shape - Trillion Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

12.70 Ct Natural Orange Onyx Trillion Cut

Gems AuctionBangkok, TH

14.07 Ct Natural Blue Onyx Round Cut: Weight - 14.07 Ct / Dimensions - 18.00 x 18.00 x 7.70 mm / Shape - Round Cut / Clarity - Transparent / Origin - Brazil / Treatment - None

2026

14.07 Ct Natural Blue Onyx Round Cut

Gems AuctionBangkok, TH

13.59 Ct Natural Orange Onyx Hexagon Cut: Weight - 13.59 Ct / Dimensions - 19.30 x 17.00 x 6.90 mm / Shape - HExagon Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

13.59 Ct Natural Orange Onyx Hexagon Cut

Gems AuctionBangkok, TH

15.46 Ct Natural Black Onyx Trillion Cut: Weight - 15.46 Ct / Dimensions - 18.70 x 18.70 x 8.50 mm/ Shape - Trillion Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

15.46 Ct Natural Black Onyx Trillion Cut

Gems AuctionBangkok, TH

13.01 Ct Natural Green Onyx Hexagon Cut: Weight - 13.01 Ct / Dimensions - 18.90 x 16.50 x 7.50 mm / Shape - Hexagon Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

13.01 Ct Natural Green Onyx Hexagon Cut

Gems AuctionBangkok, TH

12.16 Ct Natural Orange Onyx Pear Cut: Weight - 12.16 Ct / Dimensions - 16.90 x 16.80 x 8.10 mm / Shape - Pear Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

12.16 Ct Natural Orange Onyx Pear Cut

Gems AuctionBangkok, TH

12.87 Ct Natural Green Onyx Pear Cut: Weight - 12.87 Ct / Dimensions - 18.20 x 17.70 x 8.10 mm / Shape - Pear Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

12.87 Ct Natural Green Onyx Pear Cut

Gems AuctionBangkok, TH

10.09 Ct Natural Blue Onyx Pear Cut: Weight - 10.09 Ct / Dimensions -16.00 x 16.00 x 7.60 mm / Shape - Pear Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

10.09 Ct Natural Blue Onyx Pear Cut

Gems AuctionBangkok, TH

11.12 Ct Natural Black Onyx Pear Cut: Weight - 11.12 Ct / Dimensions - 16.80 x 16.40 x 7.30 mm/ Shape - Pear Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

11.12 Ct Natural Black Onyx Pear Cut

Gems AuctionBangkok, TH

7.00 Ct Natural Black Onyx Pear Cut: Weight - 7.00 Ct / Dimensions - 16.30 x 12.10 x 4.40 mm / Shape - Pear Cut / Clarity - Opaque / Origin - Brazil / Treatment - None

2026

7.00 Ct Natural Black Onyx Pear Cut

Gems AuctionBangkok, TH

15.90 Ct Natural Black Onyx Hexagonal Cut: Weight - 15.90 Ct / Dimensions - 20.90 x 18.10 x 7.40 mm/ Shape - Hexa Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

15.90 Ct Natural Black Onyx Hexagonal Cut

Gems AuctionBangkok, TH

14.24 Ct Natural Green Onyx Round Cut: Weight - 14.24 Ct / Dimensions - 17.60 x 17.60 x 8.70 mm / Shape - Round Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

14.24 Ct Natural Green Onyx Round Cut

Gems AuctionBangkok, TH

12.55 Ct Natural Green Onyx Trillion Cut: Weight - 12.55 Ct / Dimensions - 17.90 x 18.00 x 7.60 mm / Shape - Trillion Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

12.55 Ct Natural Green Onyx Trillion Cut

Gems AuctionBangkok, TH

14.58 Ct Natural Blue Onyx Trillion Cut: Weight - 14.58 Ct / Dimensions - 18.80 x 18.80 x 8.10 mm / Shape - Trillion Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

14.58 Ct Natural Blue Onyx Trillion Cut

Gems AuctionBangkok, TH

39.00 Ct Natural Red Orange Onyx Round Cab: Weight - 39.00 Ct / Dimensions - 29.00 x 29.00 x 6.10 mm / Shape - Round Cab / Clarity - Opaque / Origin - Brazil / Comments - None

2026

39.00 Ct Natural Red Orange Onyx Round Cab

Gems AuctionBangkok, TH

14.19 Ct Natural Black Onyx Pear Briolette Pair: Weight - 14.19 Ct / Dimensions - 11.30 x 8.00 mm / 2 Pc's / Shape - Pear Cut / Clarity - Opaque / Origin - Brazil / Comments - None

2026

14.19 Ct Natural Black Onyx Pear Briolette Pair

Gems AuctionBangkok, TH

36.41 Ct Natural Red Orange Onyx Oval Cab: Weight - 36.41 Ct / Dimensions - 38.00 x 20.70 x 6.10 mm / Shape - Oval Cab / Clarity - Opaque / Origin - Brazil / Comments - None

2026

36.41 Ct Natural Red Orange Onyx Oval Cab

Gems AuctionBangkok, TH

5.14 Ct Natural Black Onyx Pear Cut Pair: Weight - 5.14 Ct / Dimensions - 12.00 x 8.00 x 4.20 mm / 2 Pc's / Shape - Pear Cut / Clarity - Opaque / Origin - Brazil / Treatment - None

2026

5.14 Ct Natural Black Onyx Pear Cut Pair

Gems AuctionBangkok, TH

13.65 Ct Natural Black Onyx Drilled Pear Drop: Weight - 13.65 Ct / Dimensions - 20.60 x 10.40 mm / Shape - Pear Drop / Clarity - Opaque / Origin - Brazil / Treatment - None

2026

13.65 Ct Natural Black Onyx Drilled Pear Drop

Gems AuctionBangkok, TH

24.66 Ct Natural Deep Orange Onyx Pear Cab: Weight - 24.66 Ct / Dimensions - 33.00 x 17.50 x 6.20 mm / Shape - Pear Cab / Clarity - Opaque / Origin - Brazil / Comments - None

2026

24.66 Ct Natural Deep Orange Onyx Pear Cab

Gems AuctionBangkok, TH

5.00 Ct Natural Black Onyx Round Cut Pair: Weight - 5.00 Ct / Dimensions - 8.10 x 8.10 x 5.00 mm / 2 Pc's / Shape - Round Cut / Clarity - Opaque / Origin - Brazil / Treatment - None

2026

5.00 Ct Natural Black Onyx Round Cut Pair

Gems AuctionBangkok, TH

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24

Onyx Auctions

Platinum 3.47ct Diamond Ring

14K Yellow Gold 0.45ct Diamond and Enamel Ring

18K Rose Gold Grape Garnet French Wreath Brooch

Curated Fine Gold Jewelry Vintage & Antique

Eastern European Art Gallery Inc

Starts on:

Broomall, PA, US

1800'S VENUS & PUTTI 3 PANEL OLD MASTER PAINTINGS

JILALI GHARBAOUI - ABSTRACT COMPOSITION PAINTING

CLASSIC HARLEY DAVIDSON WIDE GLIDE MOTORCYCLE

ART ANTIQUES ADVERTISING ASIAN PERSIAN COINS

Great Estates Auctioneers & Appraisers

Starts on:

ELLENVILLE, NY, US

4 days Left

Boucheron Vintage 18K Yellow Gold and 4ct Natural Sapphire Rope Dome Ring

14K Yellow and Rose Gold 1ct Diamond Choker Necklace

Faberge Imperial Russian Natural Pearl and 2ct Diamond Earrings

Fine Brands Antique Vintage and New Jewelry

Eastern European Art Gallery Inc

Starts on:

Broomall, PA, US

3 days Left

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