OTi (by Presidium) for diamonds (natural & synthetic) + non-diamond + Moissanite Magnifier Style_Hands free It is Aplanatic-achromatic (distortion-free right

It is Aplanatic-achromatic (distortion-free right the very edge

Lightweight

It can also be used for sterilising small items of jewellery to make them safe from viruses - but please  read the explanation first

- brightest for 2 hours (1 hour at its very brightest then 1 hour not quite so bright)

to the non-expert Colour Grade D will probably look the same as Colour Grade J

OTi (by Presidium) for diamonds (natural & synthetic) + non-diamond + Moissanite Magnifier Style_Hands free It is Aplanatic-achromatic (distortion-free rightSummary The Oti is a combined standard (thermal) tester for diamond non diamond, plus the latest technology (UV absorption) to distinguish natural diamond from synthetic diamond, and it also tests for Moissanite. One probe, one test, the onboard computer works out the answer. Instruction manual (pdf download) Video (youtube) carrying out the test Videos (youtube) everything you need to know (7 videos, from 59 secs, to 1mn 45 secs) Detail Tests for: