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Black Onyx Flat Plate Cabochons

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Black Onyx Flat Plate Cabochons

These jet black flat plate onyx cabochons have a wonderful high polish giving them a lovely finish. They would lovely set in either silver or gold.

  • Cabochon (flat bottom, flat top, undrilled)
  • Hardness of 6.5-7 on the Mohs scale
  • Natural gemstone
  • Healing properties: protection, development of emotional and physical strength
  • Sold individually
  • Country of origin-India

Special requests

Did you know that you can add special requests for gemstones? Whether you're after matching pairs, a particular colour, pattern or shape, or even to fit a specific setting just let us know in your shopping basket and our team will personally spend time trying our very best to select the perfect gemstone for you. Learn more

Product code: 6544

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What Our Customers Say...

Hayley Meredith
I just wanted to say thank you for the amazing service from Kernowcraft.  I find your website easy to navigate, products good quality and the delivery is second to none!
Vivienne Sadler
Always too many temptations, but a joy to look through. Thank you for such good service. I have to be very strict with myself when I visit your website!
Rhiannon Piper
The opal I received is absolutely amazing and just perfect. Its such a beautiful stone and I tried it with my wedding dress yesterday and its just set it off so well.
Sarah Tiley
Whenever I feel unsure as to where to purchase any stones or jewellery requirements I always go back to what is familiar. Thank you Kernowcraft for being true to your customers.
Kim Thomson
I have been using Kernowcraft since 1997 and still regularly recommend them to all my students.
Dorota Todd
I just wanted to say how impressed I am with the quality of pearls in my recent order! Thank you so much for taking time and matching them into pairs, it's very appreciated. Thank you and I am definitely going to buy at your store in the future.
Claire
I just wanted to say a big thank you for the beautiful sapphires that arrived today. Hannah picked out just what I wanted and I’m over the moon with them.
Helen
Just wanted to say thank you for picking such beautiful stones for my order. I'm halfway through making a ring for my daughter and the rose cut rainbow moonstones are particularly yummy. Thank you!
Denise Mountain Pike
I recently ordered a couple of replacement stones from you and I'd just like to say how happy I am with my purchase and very impressed with the friendly helpful service you gave. Thank you very much.
April Luescher
Beautiful quality and colours - I rarely buy semi-precious stones anywhere else these days. Very helpful, superb service, speedy delivery. What more could anyone want?
Lynn Carson
I bought the sand dollar charm to make a holiday bracelet. It’s really lovely, subtle and pretty detail. Perfect piece and exactly as described.
Lydia Farrow
Just to say that I have always had the best possible results for every order - however small and all your products are of excellent quality.
Catriona
Thank you for my recent order as I'm blown away by all the lovely pieces. I don't really know what to start work on first. Thank you for supplying top quality items on a easy to use website. 
A
I added a special request for moonstones with strong blue/green flashes and received 3 briolettes which were exactly that - some of the prettiest moonstones I’ve seen. Thank you!
Deborah Roberts-Barter
I have sent a couple of email enquiries today, which have been really quickly answered. This customer service is what made me order with you straight away!
Jill Hammersely
I just wanted to say a massive thank you to the team, particularly the ladies that helped me yesterday. Delivery took less than 24hrs, that's amazing. The quality of both cabochons and settings are stunning.
Daniel Coe
The customer service I have received from you and the help has been second to none. If only all companies were so helpful and understanding that i am a complete newbie. The retail world would be a better place.
Frank Wilson
I have grown as a jewellery maker over the last year or so due to the encouragement the team have given me - they are all experienced jewellery makers or keen crafters. They have helped to guide me through my inventory, offered helpful tips and advice on all manner of silver working.
Helen Bowles
I felt compelled to write to you, as I'm so impressed with your quick service! I've been a Kernowcraft customer for years and have never had anything but reliable, efficient service from you.
Lauren Jodie Piercy
Beautiful gemstones and a lot of choice. Running competitions and being interactive as well really sets them apart. Keep up the interesting content.
Gloria Williams
I just came across your online shop and my first reaction was wow! It has everything i need to carry on with my jewellery making. I've seen things that i have been looking for and couldn't find in so many other shops!
Jenny Kirkwood
Love the service you get and appreciate the range of products on offer. I just used the alligator tape for the first time and found myself asking - where have you been all my life?
Frank Wilson
It is always a joy to deal with your Company and your hints and tips always help me to improve my skills and encourage my interests. Thank you for caring about us small enthusiastic silversmiths!
Marshal
Thank you to the lady who went to a great deal of trouble to find a very small opal that fitted a bezel cup. The work is now complete and looks very nice - my wife is delighted with the result.
Eve
The stones are excellent quality, and the special request I put in for dark citrines and paired malachites has been met perfectly. I am delighted with Kernowcraft, and will be back!
Mihaela Ciubotaru
I am very happy with my products... it is wonderful to have a reliable source of materials and gems with a fast delivery and a lot of tips on how to use the tools we buy.
Julia Schofield
I’ve used Kernowcraft as a supplier for findings and pearls since beginning my business 8 years ago, because I know I can absolutely rely on the quality I get. The service is pretty impeccable too.
Janice Scragg
Your website is easy to use, your products excellent, nice friendly service on the phone and delivery quick, excellent. Thank you and well done Kernowcraft. Gold star!
Christine Wood
Just want to say a very big thank you for your quick delivery and excellent service. The stones I ordered arrived this morning, the quality and price are second to none. I was delighted with my purchase. Thank you so much.
Joel Martin
Great, easy to navigate website with wonderful clear photographs. I look forward to receiving my order... it's going to be like Christmas!
Lenna
Hi, just a quick email to thank you for my cross and chain - I love it. What a speedy service - ordered it yesterday and wearing it tonight. Thank you very much.
Claire Hall
Kernowcraft is my go to for all my gemstones! Their stones are the first ones I show when offering my clients stone choices and I can't recommend their customer service enough! This is a company that cares!
Catherine Warwick
Just received my order that I placed only yesterday. I wanted to say thank you! I am delighted with the choice of cabochon, setting and books. Now I have to read up on how to set it! FABULOUS SERVICE - Thank you!
George Inglis
Great looking website, one of the best I've seen and used. Good search function, good range of products, good prices and great advice for jewellery makers of all abilities. All-in-all a great site and one I'll use again and again.
Maggi Henman
I’ve just had my first order from you and I am so pleased with the fast delivery and the quality of the products. The satin cords and the findings really finished off my ceramic jewellery.
Jaquie
It can be difficult to order gemstones online - no such worries with Kernowcraft - you really do care about your products & clients and it shows.