Research & News
Nephrite Bracelet with Filled Cavity
A jade bracelet contains unusual fillers, used to create a smooth surface.
Cat’s-Eye Rock Consisting of Jadeite and Amphibole
Raman spectroscopy reveals that a green bead, showing chatoyancy on one side, comprises jadeite and amphibole.
Large Faceted Afghanite
A report on the largest facet-grade afghanite seen in the GIA gem identification department.
Jeweler’s Goal: Unite Gem, Jewelry Industry in Mexico
Alumni chapter leader wants to help develop Mexico’s third-most populous city into a thriving jewelry design and manufacturing hub.
Devitrified Glass Imitation of Demantoid
A yellowish green specimen with horsetail-like inclusions is found to be glass rather than demantoid garnet.
15 Carat HPHT Synthetic Diamond
A synthetic diamond seen in the Carlsbad lab is the largest faceted lab-grown diamond examined by GIA.