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1.10 ct. Natural Unheated Greenish Blue Sapphire - TANZANIA: 1.10 ct. Natural Unheated Greenish Blue Sapphire - TANZANIA Color - Greenish Blue Cut - Pear Clarity - VS Ct. wt. - 1.10 ct. Dimensions - 7.20 x 5.30 x 3.40 mm Origin - T

4 days Left

1.10 ct. Natural Unheated Greenish Blue Sapphire - TANZANIA

Kissing Auction

(5) Different Seashell Specimens: (5) Different Seashell Specimens. Includes a Queen's conch, an Atlantic Triton's trumpet shell, lightning whelk, a giant spider conch, and a Chiragra spider conch. An excellently diverse colle

Apr 19, 2026

(5) Different Seashell Specimens

Sarasota Estate Auction

Floridian Pocillopora Damicornis Brownstem Coral Specimen: Floridian Pocillopora Damicornis Brownstem Coral Specimen. An exceptional example, with the stem mostly having withstood the ravages of the bleaching process. Size: 6 1/2 x 7 x 8 in.

Apr 19, 2026

Floridian Pocillopora Damicornis Brownstem Coral Specimen

Sarasota Estate Auction

A LARGE AMETHYST GEODE POLISHED EDGES: 19.2 KILOGRAMS AND 16" TALL. Nice dark purple

Apr 21, 2026

A LARGE AMETHYST GEODE POLISHED EDGES

J. Greenstein & Co., Inc.

Pair of Mounted Abalone Shells: Pair of Mounted Abalone Shells Height 12.75 in.

Apr 25, 2026

Pair of Mounted Abalone Shells

Rafael Osona Auctions

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Loose Lab Diamond - IGI Emerald 0.33ct Fancy Intense Blue VVS2: Loose Lab Diamond - IGI Emerald 0.33ct Fancy Intense Blue VVS2 Experience the rare beauty of a Fancy Intense Blue lab diamond, certified by IGI as VVS2 in clarity and VG in polish and symmetry. This s

1 day Left

Loose Lab Diamond - IGI Emerald 0.33ct Fancy Intense Blue VVS2

HIGHLY POLISHED AMETHYST GEODE.: 9.5 kilo and 10.5" tall, Excellent purple color.

Apr 21, 2026

HIGHLY POLISHED AMETHYST GEODE.

J. Greenstein & Co., Inc.

Trays/Bowls, Fluorite, Agate, Rock Crystal, Hardstone: Four trays/bowls, to include fluorite, agate, rock crystal, and hardstone, largest 2" H x 6 1/2" W x 4 3/4" D. Provenance: Estate of Thomas Nicholson of Palm Beach, Florida and Stratham, New Hampshire

Apr 18, 2026

Trays/Bowls, Fluorite, Agate, Rock Crystal, Hardstone

Kaminski Auctions

A RARE SCOLECITE SPECIMEN FORMATION: Rare and delicate scolecite specimen from the Deccan Basalts, Aurangabad, Maharashtra, India 5.5" wide.

Apr 21, 2026

A RARE SCOLECITE SPECIMEN FORMATION

J. Greenstein & Co., Inc.

AMETHYST CATHEDRAL GEODE WITH POLISHED EDGES: 21" TALL X 14" AT IT'S WIDEST 26.2 KILOGRAMS

Apr 21, 2026

AMETHYST CATHEDRAL GEODE WITH POLISHED EDGES

J. Greenstein & Co., Inc.

Polished Bullseye Malachite Specimen With Cut Base: Large polished bullseye malachite specimen from the DR Congo. Bottom was solidified and painted. 5.5" x 8.5" x 3.75". 8 lbs, 7 oz.

Apr 26, 2026

Polished Bullseye Malachite Specimen With Cut Base

Fossils & Gemstones of Houston

8.9ct Montana Green Sapphire Trillion Cut: triangular-shaped gemstone featuring 40-50+ facets for high brilliance. It generally displays a vibrant green tone. Trillion cuts enhance color distribution and light return.

5 days Left

8.9ct Montana Green Sapphire Trillion Cut

California Gemstones

5.68 Cts IGI Certified Spessartite: Fiery 5.68ct IGI-certified spessartite garnet with warm orange-red saturation.

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5.68 Cts IGI Certified Spessartite

Nile Jewels Co Ltd

2.74 Cts Fancy Black Diamond: Striking 2.74 carat fancy black diamond boasting metallic sheen and unique facets for dramatic contrast.

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2.74 Cts Fancy Black Diamond

Nile Jewels Co Ltd

Red Culture Meteorite Figurine: This red cultural period meteorite figurine has magnetism, high hardness, and exhibits a unique texture and craftsmanship. Its vivid shape and meticulous detail reflect the artistic style and cultural

Apr 13, 2026

Red Culture Meteorite Figurine

Impressive 13.01 Carat Pear Cut Natural Amethyst: Impressive 13.01 Carat Pear Cut Natural Amethyst. Pear cut amethyst displaying deep, regal purple hues. Accompanied by a formal Certificate of Appraisal (ID: AM0218983EDD1301) confirming its technical

Apr 18, 2026

Impressive 13.01 Carat Pear Cut Natural Amethyst

Sarasota Estate Auction

Incredible Acropora Table Coral Display Specimen: Incredible Acropora Table Coral Display Specimen. Classic nodule structure, with few areas of damage. Size: 16 x 13 x 4 3/4 in. Acropora is a genus of small polyp stony coral in the phylum

Apr 19, 2026

Incredible Acropora Table Coral Display Specimen

Sarasota Estate Auction

AMETHYST CATHEDRAL GEODE WITH POLISHED EDGES: 25" TALL, 9" AT IT'S WIDEST 28.5 KILOGRAMS

Apr 21, 2026

AMETHYST CATHEDRAL GEODE WITH POLISHED EDGES

J. Greenstein & Co., Inc.

Loose Diamond - ROUND 0.18ct E VVS2: Loose Diamond - ROUND 0.18ct E VVS2 Source: Natural Shape: ROUND Carats: 0.18 Color: E Clarity: VVS2 Certification: GIA Video:

4 days Left

Loose Diamond - ROUND 0.18ct E VVS2

A MASSIVE AMETHYST CATHEDRAL. WONDERFUL COLORS: A MASSIVE 50 KILOGRAMS AND 28" TALL, here is a magnificent cathedral

Apr 21, 2026

A MASSIVE AMETHYST CATHEDRAL. WONDERFUL COLORS

J. Greenstein & Co., Inc.

Gemstone Cockatoo Sculpture on Amethyst Crystal Base: A majestic Brazilian gemstone sculpture of a cockatoo, perched on a glittering cluster of natural amethyst crystals, radiating both elegance and exotic charm. This piece exemplifies the harmony of min

6 days Left

Gemstone Cockatoo Sculpture on Amethyst Crystal Base

Lux et Umbra LLC

A LARGE AMETHYST CATHEDRAL POLISHED EDGES: Deep purple in color. With a nice soft blue polished rim. 34 kilograms and 24" tall.

Apr 21, 2026

A LARGE AMETHYST CATHEDRAL POLISHED EDGES

J. Greenstein & Co., Inc.

9.38 cts 6-Ray Best Star Flash natural star Sapphire: Outstanding 9.38 carat large star sapphire with exceptional 6-ray star sharpness and vivid flash. Rare size for collectors.

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9.38 cts 6-Ray Best Star Flash natural star Sapphire

Nile Jewels Co Ltd

6.19 Cts IGI Certified Aquamarine: Pure 6.19ct IGI-certified aquamarine with ice-clear blue and minimal inclusions.

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6.19 Cts IGI Certified Aquamarine

Nile Jewels Co Ltd

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