Useful links

Author: Nikoleta, Published: 15.12.2021

Handbook PDFs – Mineralogical Society of America

Mineralogical database mindat.org

Mineralogy Database

Gemological Institute of America (GIA)

Hoge Raad voor Diamant (HRD)

International Gemological Institute (IGI)

International Gem Society (IGS)

Gübelin Gemmological Laboratory

Gemology Project

Nelson, S. 2016. Mineralogy. – Tulane University, Department of Earth & Environmental Sciences 2110, 24 lectures

Online Gemological Forum

Ruby-Sapphire.com

https://mgu.bg