I've been collecting jewelry for years and if I couldn't absolutely be sure what I was working with I just didn't post them. I kept telling myself that one day I would take them to an appraiser but years went by and I've created quite the pile of "unknowns". I finally caved and spent the $260 on a Presidium II gem tester and I'm now addicted. I can't believe some of the things I've found already. WOW! And I still have so much left to test out!! *Side note: I totally reached out to see if they wo