Post subject: Re: Hanneman Tanzanite Filter unexpected results
Posted: Fri Jul 15, 2022 3:57 am
New to the Forum or The Quiet Type
Joined: Thu Jul 14, 2022 2:08 am Posts: 1
mitchnbarb wrote:
Hi,
I am new to the GemologyOnline community.
I have a question I was hoping someone might answer. I have a Tanzanite (seller guarantees it's real, no certificate) that shows light brown under a chelsea filter as it's supposed to, slightly dichroic under calcite dichroscope, but under the Hanneman Tanzanite filter and a strong incandescent bulb, the stone remains dark blue, when it is supposed to pink-ish. I did manage to find one pink relfection of a pavillion facet, but that's all. Can this happen with Tanzanite or is it fake? I do not have a gem refractometer (working on it), but with my 1 ml graduated cylinders (had to estimate volume displacement between the ml lines) and some math, I found the SG to be about 3.22 - close to the 3.35.
Thanks! Mitch
If you have any question in testing jewelry, you can contact us, i have been a proffessional jewelry tester for 5 years.
Users browsing this forum: No registered users and 17 guests
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum