Yellow is the most abundant color of natural fancy diamonds, yet they still represent a very small percentage of all diamonds. The first major source of yellow diamonds was found in the late 1860s in ...

ABOUT GIA An independent nonprofit organization, GIA (Gemological Institute of America), established in 1931, is recognized as the world’s foremost authority in gemology. GIA invented the famous 4Cs ...

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 ...

Synthetic gems generally have inclusions specific to their method of growth. These characteristics include translucent to opaque coloring, coarseness, and a web-like appearance, which are stark ...

The Fall issue of Gems & Gemology provides a glimpse into the future of gemology, with a paradigm-shifting approach to assessing fancy-shaped diamonds, the use of machine learning algorithms in gem ...

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.

Touchstone method There are a few scientific methods for precisely determining karat gold purity, some destructive (fire assay) and others nondestructive (X-ray fluorescence). Both methods require ...

Another way to measure a ring is to take a measurement of the inside and determine the finger size from a standard chart. The inside of the ring must be perfectly round for this to work.

Gem and mineral hardness is measured on the Mohs scale. The numbers are based on the relative ease or difficulty with which one mineral can be scratched by another. But the Mohs scale is deceptive.

This exhibit features 50 exquisite gemstone jewelry pieces and objects from India on loan from a private collection. Never seen in public, these pieces - including several from the magnificent Mughal ...

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 ...

The quarterly journal of the Gemological Institute of America.