Rocks, Minerals & Fossils

Unmounted opal First Image

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Unmounted opal First Image

Unmounted opal

Total Sales7 Sold

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1.98 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 11x8mm, 27XC (1 of 2)

1.98 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 11x8mm, 27XC

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3.77 ct Fancy Cabochon Natural Multicolor Opal Triplet (1 of 3)

3.77 ct Fancy Cabochon Natural Multicolor Opal Triplet

Weatherham Estate Treasures

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18.55 ct Oval Cabochon Rainbow Bluish-White Opal Gemstone (1 of 3)

18.55 ct Oval Cabochon Rainbow Bluish-White Opal Gemstone

Weatherham Estate Treasures

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4.54 Carats Multicolor Opal Selection - Natural Welo Ethiopian Stones, 39XC (1 of 2)

4.54 Carats Multicolor Opal Selection - Natural Welo Ethiopian Stones, 39XC

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5.88 Carats Oval Cabochon Opal - Natural Ethiopian Stone 14.7x8.1x7.3mm, 49XH (1 of 2)

5.88 Carats Oval Cabochon Opal - Natural Ethiopian Stone 14.7x8.1x7.3mm, 49XH

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3.11 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 13x9mm, 42XA (1 of 2)

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4.68 Carats Neon Grove Welo Opal - Natural Ethiopian Gemstone 14.9x9.8x6.6mm, 36XH (1 of 2)

4.68 Carats Neon Grove Welo Opal - Natural Ethiopian Gemstone 14.9x9.8x6.6mm, 36XH

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2.72 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 11x8mm, 30XC (1 of 2)

2.72 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 11x8mm, 30XC

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3.37 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 13x9mm, 47XA (1 of 2)

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2.86 ct Natural Multicolor Opal Triplet, Oval Cabochon, Opaque, Australia (1 of 3)

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Weatherham Estate Treasures

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2.90 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 13x10mm, 18XC (1 of 2)

2.90 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 13x10mm, 18XC

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4.06 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 13x9mm, 49XA (1 of 2)

4.06 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 13x9mm, 49XA

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2.88 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 13x11mm, 24XC (1 of 2)

2.88 Carats Play-of-Color Welo Opal - Natural Ethiopian Gem 13x11mm, 24XC

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22.5ct Oval Cut Cabochon Bright Iridescence Multicolor Black Opal Gemstone (1 of 3)

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Weatherham Estate Treasures

Feb 12, 2026

Natural Multi Color Opal 1.29 Ct. Oval Cabochon Shape 7.9 x 6.4 Mm Gemstone from Ethiopia (1 of 3)

Natural Multi Color Opal 1.29 Ct. Oval Cabochon Shape 7.9 x 6.4 Mm Gemstone from Ethiopia

Treasure of Gems & Jewelry

Feb 15, 2026

3.37 Carats Rainbow Fire Welo Opal - Natural Ethiopian Gemstone 14.9x9.7x5.1mm, 2XH (1 of 2)

3.37 Carats Rainbow Fire Welo Opal - Natural Ethiopian Gemstone 14.9x9.7x5.1mm, 2XH

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Unmounted opal (1 of 3)

Unmounted opal Unmounted opal featuring one irregular form opal cabochon displaying blue, green and orange play of color, measuring approximately 20.60 x 20.90 x 7.17 mm and weighs 20.41 cts.

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Unmounted opal doublets (1 of 1)

Unmounted opal doublets 118** doublets of assorted shapes and sizes, weighing in total approximately 135.20 carats

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Unmounted opal (1 of 2)

Unmounted opal Unmounted opal the unmounted oval crystal opal cabochon, exhibits a light gray body color, both broad and block patterns of blue-green to orange-red play-of-colors, measuring approximately 11.19 x 9.4

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A group of unmounted opal (1 of 1)

A group of unmounted opal A group of unmounted opalcomprising of 28 oval and round opal and fire opal cabochons, weighing from approximately 0.66 - 7.58 carats; weighing in total approximately: 59.95 carats

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A group of unmounted opals (1 of 1)

A group of unmounted opals A group of unmounted opals comprising 19 round and oval cabochons and one rectangular faceted opal, weighing from approximately 0.77 to 16.49 carats, all crazed and/or cracked; estimated total gem wei

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Unmounted Opal (1 of 4)

Unmounted Opal Unmounted OpalThe unmounted pear-shape opal cabochon, measuring approximately 24.1 x 13.51 x 10.55 mm, weighing 15.37 cts.

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AN UNMOUNTED OPAL cabochon cut, 7.33 carats. (1 of 1)

AN UNMOUNTED OPAL cabochon cut, 7.33 carats.AN UNMOUNTED OPAL cabochon cut, 7.33 carats.

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Unmounted opal (1 of 3)

Unmounted opal Unmounted opal the unmounted irregular tear drop shaped opal flat cabochon, measures approximately 19.80 x 13.30 x 2.93 mm, weighs 4.56 cts., displays broad flashes of green with some blue and orange

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Unmounted opal (1 of 2)

Unmounted opal Unmounted opalfeaturing one oval opal cabochon displaying flashes of blue, green and orange-red play of color, measuring approximately 24.64 x 14.18 x 4.57 mm and weighs 9.28 cts.

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A Collection of Unmounted Opals. (1 of 1)

A Collection of Unmounted Opals.A Collection of Unmounted Opals. Comprising a black opal, boulder opals and Australian opals. Together with an opal tie tack in a goldfilled mounting

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Unmounted Opal (1 of 3)

Unmounted Opal Unmounted OpalThe unmounted freeform-shape opal measuring approximately 30.59 x 16.30 x 6.49 mm, weighing 14.70 cts.

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An unmounted opal (1 of 1)

An unmounted opal the oval opal cabochon weighing 4.57 carats

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Unmounted Black Opal. (1 of 4)

Unmounted Black Opal.Unmounted Black Opal. The unmounted freeform black opal measuring approximately 21 x 14 mm and weighing approximately 10.0 cts.

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JEWELRY. Collection of Unmounted Carved Opals. (1 of 12)

JEWELRY. Collection of Unmounted Carved Opals.Collection of (6) carved opal cameos including a Native American chief and several beauties. Most bags contain the original owner's notes - do not assume this is fact. This lot is being sold is - if y

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AN UNMOUNTED CARVED OPAL carved depicting a Lakota tribe chief, 111.05 carats. (1 of 1)

AN UNMOUNTED CARVED OPAL carved depicting a Lakota tribe chief, 111.05 carats.AN UNMOUNTED CARVED OPAL carved depicting a Lakota tribe chief, 111.05 carats.

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Unmounted White Opal. (1 of 4)

Unmounted White Opal.Unmounted White Opal. The unmounted freeform white opal measuring approximately 22.5 x 13 mm and weighing approximately 9.5 cts.

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Opal Unmounted Cabochon, 1.8g (1 of 5)

Opal Unmounted Cabochon, 1.8g Opal Unmounted Cabochon, 1.8g | 13mm X 19mm. Good play-of-color. Strong pink, some green. Provenance: From the Estate of Prominent Collector, Leon Zielinski, Macomb County, MI

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(Lot of 2) Unmounted boulder opals (1 of 2)

(Lot of 2) Unmounted boulder opals (Lot of 2) Unmounted boulder opalsfeaturing one half round boulder opal displaying a thin layer of blue green play-of-color flashes and matrix, measuring approximately 30.00 x 13.80 x 6.00 mm and weig

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NO RESERVE - AN UNMOUNTED BOULDER OPAL cabochon cut, 12.65 carats, 2.3cm, 2.6g. (1 of 1)

NO RESERVE - AN UNMOUNTED BOULDER OPAL cabochon cut, 12.65 carats, 2.3cm, 2.6g. NO RESERVE - AN UNMOUNTED BOULDER OPAL cabochon cut, 12.65 carats, 2.3cm, 2.6g. 

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11 pc Luminous Opal Unmounted Jewelers Gemstone Collection (1 of 9)

11 pc Luminous Opal Unmounted Jewelers Gemstone Collection Gorgeous rainbow spangle, sizes ranging from 7x5mm to 12x10mm, cases shown included.

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Opal, Unmounted, Rectangular 3 X 2cm 8g (1 of 6)

Opal, Unmounted, Rectangular 3 X 2cm 8g Opal, Unmounted, Rectangular 3 X 2cm 8g | Unusually large. Faint pink and green. Provenance: From the Estate of Prominent Collector, Leon Zielinski, Macomb County, MI

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3.2ct Opal, Unmounted 0.6g (1 of 8)

3.2ct Opal, Unmounted 0.6g 3.2ct Opal, Unmounted 0.6g | 14 X 10 mm. Good fire, pink hues. Provenance: From the Estate of Prominent Collector, Leon Zielinski, Macomb County, MI

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Unmounted black opal (1 of 3)

Unmounted black opal Unmounted black opalfeaturing one round black opal cabochon displaying broad flashes of dark blue to red play of color, measuring approximately 12.50 x 12.56 x 6.98 mm and weighs 7.03 cts. Note: Opal

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Trio of Large Carat Polished Spangled Glowing Opal Unmounted Gemstones (1 of 16)

Trio of Large Carat Polished Spangled Glowing Opal Unmounted Gemstones 3 pc Opal gemstone collection accompanied by the cases shown, 16x7mm, 16x8mm and 17x7mm are the approximate sizes, the lighter hued gem is thicker and more domed then the other two which are more gray

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