I have two Amethysts set in Jewlerry. By looking carefully I found that the facettes and the whole Stone Looks different to other Amethysts I have seen before. -Lots of smudges. On the outer Stone and also inside the Stone -The facetts are not sharp. They are very smooth. It Looks like as if the Piece was molded/casted
The refractometer tells me it should be a Amethyst.
Just in broad strokes, rounded facets are never indicative of a synthetic. You can't cast a synthetic that way--they are grown as boules or crystals and have to be faceted like any other stones. Glass can be cast but identification is trivial on other factors. I'm not sure what you mean by "Smudges" though. Color zoning is typical of natural amethyst and less so of synthetic amethyst--no doubt it could be done, as we've seen in synthetic ametrine, but the types of zoning produced are clearly limited. Edit: by the way, the above thesis is a real delight. The grammar may not be the best but it is a very sparse, direct presentation of some interesting systematically collected data.
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
Stephen Challener wrote:
Edit: by the way, the above thesis is a real delight. The grammar may not be the best but it is a very sparse, direct presentation of some interesting systematically collected data.
I really think this thesis was a great find. Lots of really useful info and I didn't notice any grammar issues.
Joined: Wed Sep 02, 2015 10:52 pm Posts: 1131 Location: Central Queensland, Australia
It looks as though they have gone straight from a bit of a coarse lap to the polish, leaving lots of scratches, the edges of which have been smoothed by the polish.
i see round facets and orange peel on the surface. might be just moulded glass. Topic starter please check for birifrigence using refractometer and polaricope. Sorry for my English
Hi Barbra, thank you very much for the PDF Link on distinguishing the genuine pieces from the synthetics. Very valuable. I will check on Monday again with the polariskop for twinned brazilian marks. To @ the other members who cometed. Thank you. Afterall it might only be molded glass, as it does look to have very soft facettes. Will also test again with the refractometer.. rgds Mike
Twinned crystal test is not reliable for synthetic/natural origine. They leard how to grow twinned quartz synthetics about 20 years ago and still grow it sometimes
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
Cool...but we still don't know if it is natural of synthetic. Twinning should not be dismissed. Just because something CAN be done does not mean it IS being done.
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