Provides a visual guide to the internal features of natural, synthetic and treated rubies.
Read MoreThe heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.
Read More
A peridot-like bright greenish yellow to green gem material called “green amber” has recently appeared in the gem market.
Read MoreWidely known as a rock-forming mineral, andalusite is not frequently encountered as a gem material.
Read More
The authors used Vis-NIR spectral measurements combined with LA-ICP-MS data to investigate the usefulness of absorption spectra.
Read MoreRed copper-containing plagioclase feldspar from Oregon has been available for over a century. In the early 2000s, new localities for copper-bearing feldspar were reported from the Democratic Republic of the Congo and from Tibet or an unspecified locality in China.
Read MoreA systematic study of 15 neutron-irradiated blue topaz samples was conducted using high-purity germanium (HPGe) digital gamma-ray spectroscopy.
Read More
An examination of the gemmological and spectroscopic properties of CVD synthetic diamonds from Gemesis Corp.
Read MoreColour-treated brown Tahitian cultured pearls, known in the trade as “Chocolate Pearls”, have become increasingly prevalent in the market.
Read MoreGems & Gemology, the professional quarterly of GIA, debuted in 1934
Read More
