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Onyx Gemstones

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.

Onyx Gemstones

Here at Cooksongold we have an unbeatable range of loose gemstone, ready to work with, visually stunning and of the highest quality our gemstones offering is favoured by both the professional and beginner jewellery maker. Part of this range includes the most popular black coloured gemstone, the Onyx.


Gemstone Specification: Onyx gemstones measure 6.5-7 on the Mohs hardness scale. An easy stone to work with, the Onyx is a variety of the quartz family of minerals and is easily identifiable from its rich black colour. It is advised that, due to the nature of the stone, onyx gemstones are not placed in an ultrasonic, steam cleaner or in chemical cleaning solution. Our stock offering of Onyx gemstones includes a selection of round, semi-precious beads in 16” strands and round, oval and flat back cabochon stones starting from 4.00mm and going up to 15.00mm.


A great gemstone option for a range of jewellery making projects, the onyx is perfect for both beginner and professional designs. Shop the full collection and find the perfect onyx gemstone for your jewellery making today.

Metal prices
Thu 13 Jun 2024

Silver (AG)
735.93 KG

Gold (AU)
58.157 GM

Palladium (PD)
22.708 GM

Platinum (PT)
24.066 GM

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© 2024 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