X
Gemstone Search

Your Details

Please fill in your email address

Please fill in a password

Forgot your password?

2.58 ctw Black Onyx Gemstones, Onyx Gems in Round Cabochon Shape for Sale.
Photos are of Actual Products for Sale
2.58 ctw Black Onyx Stones, Natural Onyx in Round Cabochon Shape for Sale Onyx Gemstones in 7 mm (calibrated) Size for Sale, Onyx Stones in Black Color

2.58ct Natural Black Onyx, Round Cut, 6.96 mm

9.6 out of 10
See Bizrate Ratings for GemSelect
Product ID: 688029
Type: Onyx
Weight: 2.58 ct (total) 2 gems
avg. 1.29 ct
Size: 7 mm calibrated
Size: 7 mm
Exact Size: 6.96 x 3.59 mm
Diameter x Depth
Shape: Round Cabochon
Color: Black
Clarity: Opaque
Treatment: Dyed
Origin: Sri Lanka
Content: 2 pcs
Certificate Options

Checking all Boxes

  • Natural certified gemstones

    Gemstone Laboratories
  • Accept Credit, Debit Card and PayPal

    Payment Options
  • Worldwide shipping

    Shipping Options
  • 30-day risk free return policy

$
6.19
Item in Stock
Certified Gemstones

RISK FREE

30 DAY RETURN MONEY BACK GUARANTEE

100%

FULLY GUARANTEED

Product Description

These are 2.58 carat natural black Onyx gems, 2 pcs in round shape with an exact size of 6.96 mm x 3.59 mm (avg.). These loose Onyx gemstones were mined in Sri Lanka and their clarity is Opaque.

Policies

GemSelect Certified Store Reviews

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

Overall Rating -> 9 star ratings

Everything was good, the purchase was what I expected and what they show is what you get.

Posted By Mr. in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very good place to buy gemstones

Posted By Elansary in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

the selection is good as are the prices

Posted By Old man in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Great website, easy to navigate, and loads quickly. Have bought here before, very pleased!

Posted By SallyO in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Was a good experience.

Posted By Tim in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate
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
Enlarged Gemstone Image