Solid or Doublet Opal?
Solid or Doublet opal ?
I recently bought what was sold as a solid natural cabochon Opal.
When I look at it the top has lovely flecks of orange green and red in it but if you look at it from the side you can see a line and the bottom of it isn't polished.
I read that a doublet Opal has a black backing but the back of this is the same background colour as the front, a kind of creamy colour.
Could it be a doublet Opal and if so what could the backing be?
Also how could it be sold as a solid natural Opal?
Sorry I only have the picture that was from the seller as I don't have a decent camera so the side and bottom arn't shown.
Well, it is rather hard to verify the stone's credentials without seeing it first hand or a close up of the side of the stone.
A doublet opal doesn't have to have a black backing to make it a doublet - what makes a doublet is an opal having a backing to the stone.
(The backing itself may also be a slice of natural opal adhered to the Gem.)
In this case without seeing the gem, the line may be a natural colour line of the opal itself which would make it a natural solid but if there is a distinct join in the opal, then it could constitute being a doublet.
My best advice would be to inspect the line that you see with a strong magnifying glass, you should be able to tell whether the opal flow of colour is unbroken or if there is a distinct difference between the opal above the line and the suspected backing under the line.
Even run a sharp razor blade gently ( no, you won't hurt the opal) diagonally across the side, if the blade catches on that line, then there is a good chance that the stone is a doublet opal.
Hope this helps answer your question. Let me know how you go with this one.
All the best, Peter
Click here to post comments
Join in and write your own page! It's easy to do. How? Simply click here to return to Opal Questions.