Hazardous Goods!

NOTE: Unfortunately the item you've tried to add to your basket, is not eligible for delivery outside the UK. This item has not been added to your basket.

Onyx Gemstones

Our onyx gemstones come highly polished in round and cabochon shaped cuts, available in deep black as well as black and white banded colours. Onyx is a durable stone that has a hardness of 7 on the Mohs' scale.

Showing 20 of 20 products

Please note all prices listed are based on cash prices and are exclusive of VAT. Prices for precious metal products are an estimate only and can vary slightly depending upon the metal price, the actual weight and the cutting tolerances which we are able to achieve. Bullion prices are based on 10gm.

Back to top

Use Onyx Gemstones for Striking Jewellery Designs

Onyx is a polycrystalline variety of the quartz family of minerals. It is technically a type of agate and can occur in solid black or banded black and white colours. Both types are referred to as onyx within the jewellery trade. The name onyx is taken from the Greek word “onyx” which means fingernail. According to legend this name comes from the story of Eros cutting the fingernails of Aphrodite with an arrow-head whilst she slept, and God turned the clippings into stone!


Onyx is a celebratory gemstone, used in making jewellery gifts especially for Leos and also as an anniversary gift given for the seventh year of marriage. We currently stock onyx gemstones in round shapes ranging from 6mm to 12mm in size. Cabochon shapes ranging from 4mm to15mm in size, and the ring of life is available in sizes 12mm, 15mm and 20mm which are all ideal for hanging charms!


Want to know more about our Onyx gemstones? Then contact our expert team members today on 0345 100 1122 for on hand help and advice. 

Sign up for news, offers and competitions

Sign up!

  • Visa
  • Mastercard
  • Switch
  • PayPal Logo
  • Feefo logo
  • Responsible Jewellery Council
  • FairTrade
  • The National Association of Jewellers
  • ISO 9001
  • ISO 14001
  • ISO 18001

Customer Service

About Us


© 2020 Cookson Precious Metals Ltd. VAT Registration No. GB161 8062 21. Registered in England no. 2775187. Registered Office: 59-83 Vittoria Street, Birmingham, B1 3NZ
Tel: 0345 100 1122 or 0121 200 2120 Fax: 0121 212 6456