your statement pretty much assures that you had a doublet.
I knew as soon as I said that, that someone would assume it was a
doublet, which is why I pointed out that to my knowledge, it isn’t.
What I mean is that SOME of the colour has parted company, rather
than the stone just splitting in two. In other words, it is not
suitable for the strip of silver along the crack treatment. There is
some colour still there but it just looks badly damaged and not
A fairly convincing way to distinguish a doublet is to look at the
side of the stone; if you see a straight line of demarcation it's
As well as the line of demarcation, there was a vertical vein of
colour going right from the top of the opal to the bottom of the
ironstone. That doesn’t sound like a doublet to me. Unless of course,
there are some very clever people constructing doublets with vertical
veins of colour as well, so as to convince and deceive buyers. I
understand you thinking it’s a doublet and I suppose when all is said
and done, it could still be a doublet. However, the Australian dealer
I bought it from, built his business on the ideal that he does not
deal in doublets or triplets - only solid material - and so I can
only go on his assurance that what I have is a solid opal.
The obvious way to tell whether this was a doublet or not is if it
separated absolutely flat.
My original post was somewhat misleading in that I said the colour
layer had parted company from the ironstone. I didn’t mean
completely, but rather too much to make use of the stone. There are
still patches of colour.
Often however with boulder, the opal will do a concoidial fracture
meaning cupped and more or less shell like.
This happened too, at the tip of the one I have left!
Frequently also this will have a layer of rather dull and ochreish
potch where the ironstone and opal separated.
Yes, this exactly describes the layer between the colour and the
However if you want to forward me a photo of the remaining opal
with specs, I can take a look.
Thanks very much for the kind offer. I’ll try to get a photo of it
in the next couple of days.
To all who have responded, thanks, and I will post a photo as soon
as I’ve had time to capture one.