Nice images Osman. I do not understand who would buy this as natural... the star gives away its nature immediately even in an image. Big flashing warning sign
Post subject: Re: Surface diffused Synthetic Star Ruby
Posted: Mon Sep 12, 2011 9:09 pm
Platinum Member
Joined: Fri Feb 24, 2006 1:20 am Posts: 2756 Location: Southern California, U.S.A.
I've cut and seen quite a few star corundums. I've examined diffused natural sapphires and can readily sight-ID them. But I don't see any such obvious clues with this stone. Will someone explain what makes diffusion so apparent in this ruby?
Post subject: Re: Surface diffused Synthetic Star Ruby
Posted: Tue Sep 13, 2011 8:31 am
Gemology Online Veteran
Joined: Wed Dec 30, 2009 11:44 am Posts: 525 Location: PAKISTAN-Peshawar
Dear Conny Forsberg and friends, Actually this is Flame Fusion synthetic Ruby which is further heated with Cr+Ti (Fe+Ti in case of blue sapphire) to between 1300 degree to 1900 degree centigrade in a oxidizing atmosphere and then cool slowly approx 1-14 days or more. This will allow the formation of stars with abundant titanium.
This ruby is bought in Hong Kong one of our customer in the name of natural star ruby and the dealer tell him that this star ruby origin is Pakistan. But after thoroughly checking in Gems & Gemological Institute of Pakistan (GGIP)-Peshawar laboratory the stone found Surface diffuse synthetic flame fusion star ruby.
Post subject: Re: Surface diffused Synthetic Star Ruby
Posted: Tue Sep 13, 2011 11:25 am
Platinum Member
Joined: Fri Feb 24, 2006 1:20 am Posts: 2756 Location: Southern California, U.S.A.
Conny Forsberg wrote:
The star seems to be floating on top of the stone which is a warning sign for me. Should be even easier to see live.
That's what I look for in diffused natural sapphire but your eyes must be sharper than mine -- the surface effect is not that obvious to me from these images. Neither is the asterism as perfect as that normally seen in diffused flame fusion corundum which is one of its obvious visual clues. I think the low dome cut broadens the star's "legs" and gives it a more natural appearance. It's good to have a reference visual. Thanks!
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