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Agate Druzy Quartz Crystal Geode Specimen: Agate Druzy Quartz Crystal Geode Specimen, mounted on a black metal stand. Overall: 21" H x 14.5" W x 13.5" D. Provenance: From an East 53rd Street Collection. Keywords: Rock crystal, Banded agate, Mi

Mar 05, 2026

Agate Druzy Quartz Crystal Geode Specimen

Auctions at Showplace

Est. $300-$500

APOPHYLLITE & STILBITE CRYSTALS IN CAVERNOUS VUG: India, 21st century. Apophyllite crystals in a large basaltic vug containing bright salmon-pink Stilbite crystals, with additional microcrystalline formations. A small area within the interior rear fl

Feb 19, 2026

APOPHYLLITE & STILBITE CRYSTALS IN CAVERNOUS VUG

Ahlers & Ogletree Auction Gallery

Est. $500-$800

AMETHYST CATHEDRAL FORM GEODE: Deep Purple Crystal Geode Specimen, cathedral or cave shape, with polished agate edge. 12 1/2 x 8 x 5 in. (31.8 x 20.3 x 12.7 cm.)

Feb 20, 2026

AMETHYST CATHEDRAL FORM GEODE

Thomaston Place Auction Galleries

Est. $300-$400

Carole Stupell Style Modern Selenite Crystal Lamp: Carole Stupell Style Modern Selenite Crystal Lamp, gold-tone metal base, apparently unmarked. 29" H x 7" W x 6" D. Provenance: From a New York City Collection. Keywords: Lighting, Mid-Century Modern,

Feb 26, 2026

Carole Stupell Style Modern Selenite Crystal Lamp

Auctions at Showplace

Est. $200-$400

Monumental Rock Crystal Stalagmite Sculpture with Silver Leaf Base: Monumental Rock Crystal Stalagmite Sculpture with Silver Leaf Base Experience the stunning beauty of this Monumental Rock Crystal Stalagmite, designed in the style of Serge Roche. With a height of 28

Feb 15, 2026

Monumental Rock Crystal Stalagmite Sculpture with Silver Leaf Base

Est. $6,565-$8,534

Natural Multi Color Sphene With Rainbow Spark 29.69 Ct. Cushion Shape 20 x 15.4 Mm. Gemstone From: Product ID: 806507458 Product Name: Natural Sphene Weight: 29.69 CT. Size: 20 x 15.4 x 11 MM. Shape: Cushion Color: Multi Color With Rainbow Spark Clarity:VSI Luster: Adamantine Gems Origin: Madagasca

6 hrs Left

Natural Multi Color Sphene With Rainbow Spark 29.69 Ct. Cushion Shape 20 x 15.4 Mm. Gemstone From

Treasure of Gems & Jewelry

Est. $11,677-$18,349

A MAGNIFICENT AMETHYST PLATE ON A PROFESSIONAL STAND: 101 KILOGRAMS!!!! WONDERFUL COLORATION, GOOD CRYSTALS. EXCELLENT DISPAY PIECE

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A MAGNIFICENT AMETHYST PLATE ON A PROFESSIONAL STAND

J. Greenstein & Co., Inc.

Natural Vivid Pink Tourmaline 4.32 Ct. VVS Oval Shape 11.4 x 7.9 Mm. Unheated Gemstone From Nigeria: Product ID: 807250036 Product Name: Natural Tourmaline Weight: 4.32 CT. Size: 11.4 x 7.9 x 6.6 MM. Shape: Oval Color: Pink Clarity:VVS Luster: Very Good Gems Origin: Nigeria Treatment: Unheated Crysta

6 hrs Left

Natural Vivid Pink Tourmaline 4.32 Ct. VVS Oval Shape 11.4 x 7.9 Mm. Unheated Gemstone From Nigeria

Treasure of Gems & Jewelry

Est. $3,790-$5,956

Natural London Blue Topaz 100.45 Ct. Clean Pear Checkerboard Cut 33 x 26 Mm Gemstone From Brazil: Product ID: 807156415 Product Name: Natural Blue Topaz Weight: 100.45 CT. Size: 33 x 26 x 17.2 MM. Shape: Pear Checkerboard Color: London Blue Clarity:IF Luster: Beautiful Gems Origin: Brazil Treatmen

6 hrs Left

Natural London Blue Topaz 100.45 Ct. Clean Pear Checkerboard Cut 33 x 26 Mm Gemstone From Brazil

Treasure of Gems & Jewelry

Est. $3,664-$5,758

Shiva Lingam, Etc. Mineral Specimens, 3: Group of Three Mineral Specimens, comprising: black and red granite obelisk, desert rose selenite, and Shiva Lingam stone. Selenite: 3" H x 7" W x 4.5" D. Provenance: From an East 53rd Street Collecti

Mar 05, 2026

Shiva Lingam, Etc. Mineral Specimens, 3

Auctions at Showplace

Est. $400-$600

Natural Pinkish Orange Tourmaline 6.89 Ct. Clean Cushion Shape 10.8 x 10.6 Mm. Unheated Gemstone: Product ID: 807250056 Product Name: Natural Tourmaline Weight: 6.89 CT. Size: 10.8 x 10.6 x 8.3 MM. Shape: Oval Color: Orange Clarity:IF Luster: Very Good Gems Origin: Nigeria Treatment: Unheated Crys

6 hrs Left

Natural Pinkish Orange Tourmaline 6.89 Ct. Clean Cushion Shape 10.8 x 10.6 Mm. Unheated Gemstone

Treasure of Gems & Jewelry

Est. $5,556-$8,732

Natural Loose Diamond 0.18 Ct. 8 Pcs. Round Brilliant Cut Size 1.8 Mm. From Belgium: Product ID: 802102802 Product Name: Natural Natural Diamond Weight: 0.18 CT. Size: 1.8 x 1.8 x 1.1 MM. Shape: Round Brilliant Cut Color: D Clarity:VVS-VSI Luster: Scintillating Gems Origin: Belgium Tr

6 hrs Left

Natural Loose Diamond 0.18 Ct. 8 Pcs. Round Brilliant Cut Size 1.8 Mm. From Belgium

Treasure of Gems & Jewelry

Est. $1,190-$1,870

Hand-Carved Gemstone Parrot on Amethyst Cluster: A stunning and vibrant example of Brazilian gemstone artistry, this hand-carved parrot sculpture is perched atop a radiant amethyst crystal cluster, blending natural mineral beauty with lifelike detai

Feb 21, 2026

Hand-Carved Gemstone Parrot on Amethyst Cluster

Lux et Umbra LLC

Est. $1,000-$2,000

A LARGE ARTISANAL STERLING SILVER CROSS WITH AMETHYST, TURQUOISE & BAROQUE PEARLS: A highly decorative handcrafted cross pendant constructed in sculptural sterling silver wirework, enclosing large natural mineral specimens. The vertical and horizontal arms are formed from polished a

Feb 15, 2026

A LARGE ARTISANAL STERLING SILVER CROSS WITH AMETHYST, TURQUOISE & BAROQUE PEARLS

HELIOS AUCTIONS

Est. $4,000-$5,000

Natural Green Tourmaline 12.11 Ct. VVS Octagon Shape 25 x 7.3 Mm. Gemstone Unheated From Nigeria: Product ID: 807239305 Product Name: Natural Tourmaline Weight: 12.11 CT. Size: 25 x 7.3 x 6.3 MM. Shape: Octagon Color: Green Clarity:VVS Luster: Very Good Gems Origin: Nigeria Treatment: Unheated Cry

6 hrs Left

Natural Green Tourmaline 12.11 Ct. VVS Octagon Shape 25 x 7.3 Mm. Gemstone Unheated From Nigeria

Treasure of Gems & Jewelry

Est. $6,529-$10,259

Natural Pink Tourmaline 5.40 Ct. Oval Shape 10.3 x 9 Mm. Unheated Gemstone From Mozambique: Product ID: 807218856 Product Name: Natural Tourmaline Weight: 5.40 CT. Size: 10.3 x 9 x 8.7 MM. Shape: Oval Color: Pink Clarity:VSI Luster: Very Good Gems Origin: Mozambique , Africa Treatment: Unhea

6 hrs Left

Natural Pink Tourmaline 5.40 Ct. Oval Shape 10.3 x 9 Mm. Unheated Gemstone From Mozambique

Treasure of Gems & Jewelry

Est. $3,074-$4,832

Natural Blue Sapphire 2.44 Ct. Fancy Shape 7.73 x 9.1 Mm. Gemstone From Thailand: Product ID: 806006189 Product Name: Natural Blue Sapphire Weight: 2.44 CT. Size: 7.73 x 9.15 x 4.79 MM. Shape: Fancy Color: Blue Clarity:VSI Luster: Good Gems Origin: Thailand Treatment: Heated Crysta

6 hrs Left

Natural Blue Sapphire 2.44 Ct. Fancy Shape 7.73 x 9.1 Mm. Gemstone From Thailand

Treasure of Gems & Jewelry

Est. $933-$1,467

Natural Blue Sapphire 1.89 Ct. Octagon Shape 8.55 x 5.13 Mm. Gemstone From Madagascar: Product ID: 806007495 Product Name: Natural Blue Sapphire Weight: 1.89 CT. Size: 8.55 x 5.13 x 3.57 MM. Shape: Octagon Color: Blue Clarity:VSI Luster: Good Gems Origin: Madagascar Treatment: Heated Cr

6 hrs Left

Natural Blue Sapphire 1.89 Ct. Octagon Shape 8.55 x 5.13 Mm. Gemstone From Madagascar

Treasure of Gems & Jewelry

Est. $1,435-$2,255

Natural Green Emerald 1.28 Ct. Pear Shape 10.7 x 6.5 Mm. Gemstone From Columbia: Product ID: 802402120 Product Name: Natural Emerald Weight: 1.28 CT. Size: 10.7 x 6.5 x 4 MM. Shape: Pear Color: Green Clarity:SI1 Luster: Good Gems Origin: Columbia Treatment: Unheated Crystal Struct

6 hrs Left

Natural Green Emerald 1.28 Ct. Pear Shape 10.7 x 6.5 Mm. Gemstone From Columbia

Treasure of Gems & Jewelry

Est. $1,347-$2,118

Round Amethyst Crystal Geode with Polished Borders: An unusual rounded geode section with stalagmite-like formations of calcite and quartz rising from the base, polished borders revealing the celadonite shell with some exterior basalt visible; accompan

Mar 07, 2026

Round Amethyst Crystal Geode with Polished Borders

TimeLine Auctions Ltd.

Est. £2,500-£3,500

122 Pound Uruguayan Amethyst Geode WIth Large Calcite Crystal - MONUMENT: 122 pound truly exceptional dark amethyst geode with large calcite crystal from Uruguay. 17" x 20" x 13". 122 pounds, 6 ounces.

Feb 22, 2026

122 Pound Uruguayan Amethyst Geode WIth Large Calcite Crystal - MONUMENT

Fossils & Gemstones of Houston

Est. $8,000-$10,000

Natural Blue Sapphire 2.13 Ct. VVS Oval Shape 8.47 x 6.54 Mm. Gemstone From Madagascar: Product ID: 806007692 Product Name: Natural Blue Sapphire Weight: 2.13 CT. Size: 8.47 x 6.54 x 4.36 MM. Shape: Oval Color: Blue Clarity:VVS Luster: Good Gems Origin: Madagascar Treatment: Heated Cryst

6 hrs Left

Natural Blue Sapphire 2.13 Ct. VVS Oval Shape 8.47 x 6.54 Mm. Gemstone From Madagascar

Treasure of Gems & Jewelry

Est. $2,384-$3,747

Top Quality Tourmaline Crystal On Matrix - Collection Piece - 656 Grams - 115X78X68 mm: Top Quality Tourmaline Crystal On Matrix - Collection Piece - 656 Grams - 115X78X68 mmShipping Rate: $120.00 .shipping rates are determined by Parcel weight and destination.Combined shipping: We offer

2 days Left

Top Quality Tourmaline Crystal On Matrix - Collection Piece - 656 Grams - 115X78X68 mm

Fantasy Jewelry

Est. $8,000-$9,000

Blue Halite Crystal Carlsbad New Mexico Specimen: Exceptional example. 6 1/8" by 4 1/8" by 4 1/8". 1287 grams. Provenance: From the Estate of Kitty's Copper Shop Butte Montana.

4 days Left

Blue Halite Crystal Carlsbad New Mexico Specimen

Davis Brothers Auction

Est. $500-$750

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