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Home Gemstones Onyx

Loose Onyx Gemstones: Black Onyx, White Onyx and Banded Onyx for Jewelry | Onyx Carvings

Onyx Weight
Onyx Size
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Onyx Price

Size Explained

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For Example: 8-9
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Black Onyx
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2.26ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.50

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4.10ct Black Onyx, Heart, Opaque

10 x 10 mm (calibrated)

$ 4.08

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4.19ct Black Onyx, Heart, Opaque

10.5 x 10.3 mm

$ 4.17

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1.24ct Black Onyx, Round, Opaque

6.5 mm (calibrated)

$ 2.47

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1.16ct Black Onyx, Round, Opaque

6.5 mm (calibrated)

$ 2.31

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4.22ct Black Onyx, Heart, Opaque

10 x 10 mm (calibrated)

$ 4.20

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4.70ct Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.36

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8.41ctw Black Onyx, Heart, Opaque

10 x 10 mm (calibrated)

$ 8.37

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8.61ctw Black Onyx, Heart, Opaque

10.5 x 10.4 mm

$ 8.57

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4.20ct Black Onyx, Oval, Opaque

13 x 11 mm (calibrated)

$ 8.37

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2.84ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 4.71

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20.01ct Black Onyx, Pear Shape, Opaque

24.8 x 15 mm

$ 19.93

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9.19ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 9.15

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15.16ct Black Onyx, Pear Shape, Opaque

26.9 x 14.8 mm

$ 15.10

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2.88ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 5.74

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8.06ctw Black Onyx, Oval, Opaque

13 x 11 mm (calibrated)

$ 16.05

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9.38ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 9.35

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1.37ct Black Onyx, Round, Opaque

7 mm (calibrated)

$ 2.73

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3.11ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 6.19

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8.51ct Black Onyx, Pear Shape, Opaque

16.8 x 11.6 mm

$ 8.47

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2.11ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.20

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8.66ctw Black Onyx, Heart, Opaque

10 x 10 mm (calibrated)

$ 8.62

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9.97ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 9.93

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2.17ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.32

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Why Buy Onyx from GemSelect?

GemSelect Certified Store Reviews

GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!

Overall Rating -> 10 star ratings

Web site is very simple to navigate Selection is terrific

Posted By ToRa.62 in April, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Easy to use. Many options to find the right gemstone

Posted By Liz in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Wonderful purchase, can't wait to see the stone.

Posted By Tim in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.

Posted By G.W. in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very neat and to the point

Posted By Botha in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Good selection, using for custom jewlery for my wife.

Posted By Smitty in June, 2025
Source: Bizrate
Enlarged Gemstone Image