Hi, I’ve just purchased a 2.4ct thereabouts trillion cut, unheated tanzanite at around SG$900. Wanted to check if my buy is worth the price i paid for. Comes with a cert from GFCO Gem lab.
I'm not seeing terribly much information online pointing to GFCO being a reputable lab. Which starts me from a place of suspicion. If the gemstone is a blue/violet tanzanite and is reporting to be unheated, my suspicion grows!
As FYI, there not much of a markup for heated vs unheated tanzanite compared to other gems like ruby / sapphire. Do not be swayed by the fact that it is unheated unless it's a mind clean thing that it must be unheated for personal reasons.
Ah, from the picture it at least looks unheated (caveat, all identifications with online photos should be taken with a grain of salt).
I've seen really really nice top tier unheated tanzanite with great cutting and gorgeous mixtures of green, violet, and blue. Those have been priced at $450/ct.
While tough to judge actual color, I'm not crazy about the windowing (the area in the center you can mostly see through).