Spinel is a good candidate for the title of “History’s Most Underappreciated Gem.” Some ancient mines that supplied gems for royal courts from Rome to China produced spinel, but it was usually ...

Get expert, comprehensive analysis of your jewelry items. These services include assessments of natural D-to-Z diamonds, offering details such as estimated total carat weight, color and clarity ranges ...

colored stone research The microscope is one of the most important tools for a careful gemologist. Unbeknownst to the casual observer, there exists a fascinating and visually stunning microscopic ...

To plan your visit, please select the type of museum tour. General Museum Tours are 1-hour complimentary guided tours for 1-9 guests. Group Museum Tours are 1-hour complimentary guided tours for ...

Sally Eaton-Magaña, Christopher M. Breeding, and James E. Shigley ...

Dr. Gao is a research group leader of the National Gems & Jewellery Technology Administrative Center (NGTC) and director of the application R&D department at the Shenzhen Research Institute, NGTC. Ms.

Field reports, videos, photography, and firsthand accounts from mines and industry hot spots around the world.

Carbonado diamond is found only in Brazil and the Central African Republic. These unusual diamond aggregates are strongly bonded and porous, with melt-like glassy patinas unlike any conventional ...

The quarterly journal of the Gemological Institute of America.

GIA does not certify or appraise any material submitted for analysis. GIA reports (not certificates) offer technical information on the dimensions, quality and identifying characteristics of a diamond ...

Global Database - Gem grading and identification records are archived in an extensive global database for ongoing study and future reference. This information gives GIA the ability to identify items ...

The quarterly journal of the Gemological Institute of America.