I've run into a wall trying to ID this stone, it's beyond my experience and have admitted defeat. I don't think it's worth sending to a lab, I just want to know! Many thanks for any suggestions on testing or ID...
I have a blue stone set in 18ct gold, fairly modern ring. Vitreous lustre, some nibbles to facets edges. RI: 1.758 - 1.763 & 1.760 - 1.768 Biaxial no sign of curved growth lines no spectrum that I can find not LWUV fluorescent Dichroic dark and pale blue dark under CCF seems to be a cloudy type inclusion in the pavilion facets, nothing else that I can see. No colour change effect.
I was heading towards synthetic corundum until I got the RI and now thinking synthetic chrysoberyl - is that even a thing without a colour change?
Joined: Tue Apr 05, 2016 7:58 pm Posts: 1424 Location: San Marcos, CA
Maybe Barbra will see this and give some insight. I am not sure why you think it is not synthetic corundum. I'm not a qualified gemologist, just a gem cutter and experienced in the gem industry. Can you tell if that cloud is internal or possibly surface polish issue?
Maybe Barbra will see this and give some insight. I am not sure why you think it is not synthetic corundum. I'm not a qualified gemologist, just a gem cutter and experienced in the gem industry. Can you tell if that cloud is internal or possibly surface polish issue?
I'm pretty confident that the cloud is internal and it leads me to think flux maybe although I don't see a lot of synthetics so I'm not great at ID'ing them.
The stone definitely has 2 moving shadow edges which makes it biaxial (I've checked twice), isn't corundum unixaial negative?
I've checked them twice and come up with the same figures, I'm really stumped on this one!! The two flanking stones are sapphires with natural inclusions so I'm wondering if the central stone has been lost and replaced with a lookalike.
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