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Home Gemstones Onyx
6.79 ctw Black Onyx Gemstones, Onyx Gems in Trillion Cabochon Shape for Sale.
Photos are of Actual Products for Sale
6.79 ctw Black Onyx Stones, Natural Onyx in Trillion Cabochon Shape for Sale Onyx Gemstones in 9.9 x 9.4 mm Size for Sale, Onyx Stones in Black Color

6.79ct Natural Black Onyx, Trillion, 9.9x9.4 mm

9.7 out of 10
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Product ID: 668905
Type: Onyx
Weight: 6.79 ct (total) 2 gems
avg. 3.40 ct
Size: mm calibrated
Size: 9.9 x 9.4 x 5.2 mm
Exact Size: 9.89 x 9.36 x 5.18 mm
Length x Width x Depth
Shape: Trillion Cabochon
Color: Black
Clarity: Opaque
Treatment: Dyed
Origin: Sri Lanka
Content: 2 pcs
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Product Description

These are 6.79 carat natural black Onyx gems, 2 pcs in trillion shape with an exact size of 9.89 x 9.36 x 5.18 mm. These loose Onyx gemstones were mined in Sri Lanka and their clarity is Opaque.

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Overall Rating -> 10 star ratings

I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

Posted By Tim W in February, 2026
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Very neat and to the point

Posted By Botha in March, 2026
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Easy process.

Posted By Crafty Seabee in March, 2026
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I have purchased stones from gem select in the past and have been very satisfied. I expect to repeat that experience with this purchase as well

Posted By Marti in July, 2025
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The website was very easy to use.

Posted By Garnet in January, 2026
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Very good place to buy gemstones

Posted By Elansary in March, 2026
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