Description
Birefringence of diamond is observed from all directions in order to see the entire pattern and thereby determine type (I or II) and origin (natural or laboratory-grown). Handout for BrankoGems Academy Intermediate Workshops on “Screening for Diamond Types and ID of Laboratory-grown Diamonds with CPF, UV lamp and EXA PL spectrometer”.
Authors: Deljanin B., Simic D. Lightfoot R. 3rd Edition by Gemmological Research Industries Inc, 2023.