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Home Gemstones Onyx
8.31 ctw Black Onyx Gemstones, Onyx Gems in Heart Rose-Cut Shape for Sale.
Photos are of Actual Products for Sale
8.31 ctw Black Onyx Stones, Natural Onyx in Heart Rose-Cut Shape for Sale Onyx Gemstones in 10 x 10 mm (calibrated) Size for Sale, Onyx Stones in Black Color

8.31ct Natural Black Onyx, Heart Shape, 10.4x10.3 mm

9.6 out of 10
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Product ID: 669669
Type: Onyx
Weight: 8.31 ct (total) 2 gems
avg. 4.16 ct
Size: 10 x 10 mm calibrated
Size: 10.4 x 10.3 x 4.9 mm
Exact Size: 10.36 x 10.26 x 4.91 mm
Length x Width x Depth
Shape: Heart Rose-Cut
Color: Black
Clarity: Opaque
Treatment: Dyed
Origin: Sri Lanka
Content: 2 pcs
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Product Description

These are 8.31 carat natural black Onyx gems, 2 pcs in heart shape with an exact size of 10.36 x 10.26 x 4.91 mm. These loose Onyx gemstones were mined in Sri Lanka and their clarity is Opaque.

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Overall Rating -> 7 star ratings

Could not get it to work 25 times.

Posted By Dock in July, 2026
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Overall Rating -> 10 star ratings

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Overall Rating -> 9 star ratings

Very good and simple exchange

Posted By Waylon in March, 2026
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They have a wonderful selection of gems of all sorts, shapes, cuts, and quality. I am very particular about the quality of stones I buy, and found many with VVS clarity and excellent cut and polish. I am thrilled with each of the stones I purchased, and would definitely recommend GemSelect to everyone.

Posted By Debsarabs in February, 2026
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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
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