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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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GemSelect Certified Store Reviews

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Overall Rating -> 10 star ratings

My experience has always been fantastic. Today I saved 6 gems to email a customer looking for a particular color blend to fit into an east west setting, so her options were limited, but we found one she wanted, deleted all the others in the cart and order the gem she selected. It was helpful to be able to put them in the cart so I could save them until she selected the one she wanted without having to research all of them again.

Posted By RJ in January, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

The website was easy to use and informative of the selection of stones it has. I quickly found the right stone for me.

Posted By Guero in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I liked the selection of gems, and price. I did not like your PayPal process. I already have a PP account and you want me to sign up for another.

Posted By CLTCJH in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

All good

Posted By DouscheGift in August, 2025
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Overall Rating -> 10 star ratings

I loved it! Extensive inventory, great prices, I definitely will be buying from here again!

Posted By Lex in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very pleasant

Posted By Varun in June, 2026
Source: Bizrate
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