About

Raul Berenguel

Dr. Raul Berenguel holds degrees in History (Scientific Branch, 2008) and Contemporary Art (PhD, 2012) from the Universidade Aberta. He has specific expertise in the fields of history, gemology, and contemporary art. In addition, he’s also an expert in applying traditional gemological techniques to investigating art objects made from gem materials.

Articles by


Raul Berenguel

Gemstones and Refraction Liquids

Gemologists use refraction liquids to identify gemstone refractive indices (RI). Learn about the properties of these liquids and safe RI testing…

How To Evaluate Diamond Symmetry

How can you evaluate diamond symmetry without an expensive proportion scope? Learn how to build an inexpensive alternative tool that will get…

Build Your Own Gemology Tools

Are you a hobbyist or professional gemologist facing high equipment costs? Read our IGS series of articles that can help you build your own gemology…