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Home Gemstones Onyx
20.57 ctw Black Onyx Gemstones, Onyx Gems in Pear Checkerboard Shape for Sale.
Photos are of Actual Products for Sale
20.57 ctw Black Onyx Stones, Natural Onyx in Pear Checkerboard Shape for Sale Onyx Gemstones in 18 x 13 mm (calibrated) Size for Sale, Onyx Stones in Black Color

20.57ct Natural Black Onyx, Pear Shape, 17.9x13 mm

9.7 out of 10
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Product ID: 722134
Type: Onyx
Weight: 20.57 ct (total) 2 gems
avg. 10.29 ct
Size: 18 x 13 mm calibrated
Size: 17.9 x 13 x 6.6 mm
Exact Size: 17.89 x 12.98 x 6.58 mm
Length x Width x Depth
Shape: Pear Checkerboard
Color: Black
Clarity: Opaque
Treatment: Dyed
Origin: Sri Lanka
Content: 2 pcs
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Product Description

These are 20.57 carat natural black Onyx gems, 2 pcs in pear shape shape with an exact size of 17.89 x 12.98 x 6.58 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 -> 7 star ratings

easy interface for a pricless buy

Posted By Zeak in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I could see the actual gem I was buying

Posted By Bugs in December, 2025
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Overall Rating -> 9 star ratings

They have literally everything on this website! The prices are also pretty good, I was able to find plenty of nice stones that I could afford!

Posted By JC in March, 2026
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Overall Rating -> 10 star ratings

I was able to find what I wanted very easily!

Posted By Lenny in January, 2026
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Overall Rating -> 9 star ratings

Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly

Posted By Ron T in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Took a chance on purchasing my gemstones from Gemselect and was impressed. 10/10

Posted By KT in September, 2025
Source: Bizrate
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