Results for “Opal Rocks”

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3.75 Ct Natural Black Flashing Fire Opal Pear Cab: Weight - 3.75 Ct / Size - 12.60 x 9.90 x 6.20 mm / Shape - Pear Cab / Color - Black / Transparency - Translucent / Origin - Ethiopia / Treatment - Color Smoked

Jul 17, 2026

3.75 Ct Natural Black Flashing Fire Opal Pear Cab

Est.

US$100

-

US$200

US$1

Gems AuctionBangkok, TH

54.6ct Natural Mauritania Ruby Rough (Unheated), 56AT: Natural unheated Mauritanian corundum rough displaying distinct two-toned mineral matrix formation, with a solid deep magenta ruby crystalline cap fused to pale milky quartz host rock interspersed wit

2 hrs Left

54.6ct Natural Mauritania Ruby Rough (Unheated), 56AT

Est.

US$10

-

US$200

US$10

ThousandPlanetThung Wat Don, Sathorn, Bangkok

4.20 Ct "Play of Colors" Natural Ethiopian Pink Fire Opal: Gemstones: Natural Fire Opal /Carat Weights: 4.20 ct /Size or Dimensions: 15.36 X 12.46 X 5.07 mm /Treatment: Dyed

1 day Left

4.20 Ct "Play of Colors" Natural Ethiopian Pink Fire Opal

Est.

US$75

-

US$150

US$1

Finest Gems Auction Rajasthan, IN

1.76 Ct Natural Black Flashing Fire Opal Pear Cut: Weight - 1.76 Ct / Size - 12.00 x 8.50 x 5.00 mm / Shape - Pear Cut / Color - Black / Transparency - Translucent / Origin - Ethiopia / Treatment - Color Smoked

Jul 14, 2026

1.76 Ct Natural Black Flashing Fire Opal Pear Cut

Est.

US$75

-

US$150

US$4

Gems AuctionBangkok, TH

10.35 Ct Natural Multicolor Top Fire Opal Solid Rough Cab Set: Weight - 10.35 Ct / Dimensions - 17.0x7.0 - 17.5x9.0 mm / 3 Pc's / Shape - Unshaped Solid Cab / Color - Multicolor / Clarity - Translucent / Origin - Ethiopia / Treatment - None

3 days Left

10.35 Ct Natural Multicolor Top Fire Opal Solid Rough Cab Set

Est.

US$150

-

US$300

US$1

Gems AuctionBangkok, TH

5.44 Ct Natural Ethiopian Fire Opal Rough: Gemstones: Natural Fire Opal /Carat Weights: 5.44 ct /Treatment: No

1 day Left

5.44 Ct Natural Ethiopian Fire Opal Rough

Est.

US$75

-

US$150

US$1

Finest Gems Auction Rajasthan, IN

1.70 Ct Natural Black Flashing Fire Opal Octagon Cut: Weight - 1.70 Ct / Size - 10.60 x 8.70 x 3.70 mm / Shape - Octagon Cut / Color - Black / Transparency - Translucent / Origin - Ethiopia / Treatment - Color Smoked

Jul 14, 2026

1.70 Ct Natural Black Flashing Fire Opal Octagon Cut

Est.

US$75

-

US$150

US$1

Gems AuctionBangkok, TH

29.45 Ct Natural Green Opal OVal Cab: weight - 29.45 Ct / Size - 38.00 x 22.80 x 5.10 mm / Shape - Excellent OVal Cab / Origin - Brazil / Treatment - None

Jul 17, 2026

29.45 Ct Natural Green Opal OVal Cab

Est.

US$100

-

US$200

US$1

Gems AuctionBangkok, TH

OPAL ROCK STONE LAPIDARY SPECIMEN: OPAL ROCK STONE LAPIDARY SPECIMEN - Authentic estate find offered in our online auction. Perfect for collectors, resellers, and enthusiasts of vintage, antiques, minerals, rocks, crystals, jewelry, an

6 hrs Left

OPAL ROCK STONE LAPIDARY SPECIMEN

Est.

US$6

-

US$10,000

US$6

Col. Christie Hatman AuctioneersThayer, MO

39.63 Ct Natural Dendrite Opal Art OVal Cab: weight - 39.63 Ct / Dimensions - 40.00 x 27.00 x 6.00 mm / Shape & Cut - Excellent OVal Cab / Origin - Brazil / Comments - None

Jul 17, 2026

39.63 Ct Natural Dendrite Opal Art OVal Cab

Est.

US$100

-

US$200

US$1

Gems AuctionBangkok, TH

Natural Multi Color White Yellow Opal Gemstones 5.56 Ct. Oval Shape 15.1 x 11 Mm.: Product ID: 818711535 Product Name: Natural Opal Weight: 5.56 CT. Size: 15.1 x 11 x 8 MM. Shape: Oval Color: White Yellow Clarity:Opaque Luster: Good Gems Origin: Ethiopia Treatment: Unheated Crystal

6 days Left

Natural Multi Color White Yellow Opal Gemstones 5.56 Ct. Oval Shape 15.1 x 11 Mm.

Est.

US$313

-

US$493

US$1

Treasure of Gems & JewelryLake Charles, LA

25.69 Ct Natural Green Opal Cushion Cab: weight - 25.69 Ct / Dimensions - 33.00 x 20.40 x 5.00 mm / Shape & Cut - Excellent Cushion Cab / Origin - Brazil / Comments - None

Jul 17, 2026

25.69 Ct Natural Green Opal Cushion Cab

Est.

US$100

-

US$200

US$1

Gems AuctionBangkok, TH

19.53 Ct Natural Blue Opal Oval cab: Weight - 19.53 Ct / Dimensions - 29.00 x 17.80 x 5.50 mm / Shape - Oval cab / Color - Blue / Clarity - Opaque / Origin -Brazil / Treatment - None

9 hrs Left

19.53 Ct Natural Blue Opal Oval cab

Est.

US$75

-

US$150

US$14

Gems AuctionBangkok, TH

2.38 Ct Natural Black Flashing Fire Opal Pear Cab: Weight - 2.38 Ct / Size - 11.90 x 8.60 x 5.90 mm / Shape - Pear Cab / Color - Black / Transparency - Translucent / Origin - Ethiopia / Treatment - Color Smoked

Buy Now

2.38 Ct Natural Black Flashing Fire Opal Pear Cab

US$38

Gems AuctionBangkok, TH

2.01 Ct Natural Multicolor Welo Opal Round Cab Set: Weight - 2.01 Ct / Dimensions - 5.00 - 5.10 mm / 5 Pc's / Shape & Cut - Round cab / Color - Multicolor / Transparency - Translucent / Origin - Ethiopia / Comments - None

Buy Now

2.01 Ct Natural Multicolor Welo Opal Round Cab Set

US$30

Gems AuctionBangkok, TH

17.11 Ct Natural Dendrite Opal OVal Cab: weight - 17.11 Ct / Dimensions - 23.10 x 18.60 x 5.80 mm / Shape & Cut - Excellent OVal Cab / Origin - Brazil / Comments - None

Jul 17, 2026

17.11 Ct Natural Dendrite Opal OVal Cab

Est.

US$100

-

US$200

US$1

Gems AuctionBangkok, TH

38.25ct Natural Unheated Sri Lankan Purplish Blue Sapphire Rough, 62FC: This natural corundum rough is an unheated purplish blue sapphire sourced from Sri Lankan alluvial gem deposits, featuring an irregular natural native form with residual pale yellow-brown mineral matr

2 hrs Left

38.25ct Natural Unheated Sri Lankan Purplish Blue Sapphire Rough, 62FC

Est.

US$10

-

US$200

US$10

ThousandPlanetThung Wat Don, Sathorn, Bangkok

1.55 Ct Natural Multicolor Welo Opal Flash Fire Round Cab Set: Weight - 1.55 Ct / Dimensions - 5.10 - 5.20 mm / 4 Pc's / Shape & Cut - Round Cab / Color - Multicolor / Transparency - Translucent / Origin - Ethiopia / Comments - None

Jul 14, 2026

1.55 Ct Natural Multicolor Welo Opal Flash Fire Round Cab Set

Est.

US$75

-

US$150

US$1

Gems AuctionBangkok, TH

61.20 Ct "Natural Dendrite Opal: Gemstones: Natural Dendrite Opal /Carat Weights: 61.20 ct /Size or Dimensions: 53 X 26 X 5 MM Approx

1 day Left

61.20 Ct "Natural Dendrite Opal

Est.

US$75

-

US$150

US$2

Finest Gems Auction Rajasthan, IN

72.68 Ct Natural Dendrite Opal JUMBO OVal Cab: weight - 72.68 Ct / Dimensions - 50.00 x 34.00 x 5.70 mm / Shape & Cut - Excellent OVal Cab / Origin - Brazil / Comments - None

Jul 17, 2026

72.68 Ct Natural Dendrite Opal JUMBO OVal Cab

Est.

US$100

-

US$200

US$1

Gems AuctionBangkok, TH

7.29 Ct "Top Grade" Natural Ethiopian Fire Opal Rough: Gemstones: Natural Fire Opal /Carat Weights: 7.29 ct /Treatment: No

1 day Left

7.29 Ct "Top Grade" Natural Ethiopian Fire Opal Rough

Est.

US$75

-

US$150

US$1

Finest Gems Auction Rajasthan, IN

FEATURED

23.08ct Natural Australian Queensland Boulder Opal Sliced Slab Cutting Rough, 63AY: Natural sliced slab rough of Queensland boulder opal cutting grade, featuring rich color ironstone matrix with patterns. The face clearly reveals extensive opal veining and pocket formations running t

2 hrs Left

23.08ct Natural Australian Queensland Boulder Opal Sliced Slab Cutting Rough, 63AY

Est.

US$10

-

US$200

US$10

ThousandPlanetThung Wat Don, Sathorn, Bangkok

32.72 Ct Natural Blue Opal Cushion Cab: weight - 32.72 Ct / Size - 29.00 x 24.50 x 5.50 mm / Shape - Excellent Cushion Cab / Origin - Brazil / Treatment - None

Jul 17, 2026

32.72 Ct Natural Blue Opal Cushion Cab

Est.

US$100

-

US$200

US$1

Gems AuctionBangkok, TH

2.00 Ct Natural Multicolor Welo Opal Flash Fire Round Cab Pair: Weight - 2.00 Ct / Dimensions - 7.10 x 7.10 x 3.90 mm / 2 Pc's / Shape & Cut - Round Cab / Color - Multicolor / Transparency - Translucent / Origin - Ethiopia / Comments - None

Jul 14, 2026

2.00 Ct Natural Multicolor Welo Opal Flash Fire Round Cab Pair

Est.

US$75

-

US$150

US$1

Gems AuctionBangkok, TH

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