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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

9.7 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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  • Natural certified gemstones

    Gemstone Laboratories
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$
9.97
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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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Posted By HVeeder in February, 2026
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Good selection prices are reasonable!

Posted By ToRa62 in April, 2026
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I have shopped at Gemselect for nearly 20 years. I especially like that you see pictures of the exact gem you are purchasing. You are a trusted source.

Posted By DNaber in October, 2025
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IT WAS GREAT SIMPLE I WAS ABLE TO MAKE AN ACCOUNT EASY AND WAS ABLE TO FAVORITE ALL OF MY FINAL SELECTED GEMS, I JUST LOVE IT.

Posted By YE in October, 2025
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Overall Rating -> 10 star ratings

I was looking for high-quality amethyst on this site, and I was able to compare size, color, and weight in detail before making a purchase.

Posted By Atsuhisa in January, 2026
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Found a rock that met my need. Bought it!

Posted By Skot in May, 2026
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Download Identification Report PDF
BGL Brief Report $ 18.00
Turnaround Time: 3-4 working days Details
AIG Brief Report $ 35.00
Turnaround Time: 5-10 working days Details
ICA Brief Report $ 90.00
Turnaround Time: 8-12 working days Details
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