Authors: Branko Deljanin and John Chapman, 2019
This guide is for wholesalers, gemologists, jewelers and appraisers to be used as a quick reference for portable standard instruments to separate red, pink and purple transparent natural and synthetic gems using four portable in-expensive instruments: 1. 10x Loupe. 2. PL-Inspector/Jewellery Inspector 3. Portable polariscope 4. Spectroscope.