GIA ensures accurate gemological measurements across its global laboratories through rigorous metrology practices, including systematic instrument calibration, validation from traceable standards, and ...

Characterizes an anorthoclase variety of alkali feldspar found in southeast Vietnam and evaluates its potential for commercial use.

Left: Two pieces of surfite, a surfboard manufacturing byproduct, shaped like miniature surfboards. Right: The tag on the back of this piece of surfite is visible due to the translucency of the ...

Alfredo Diaz (Caribe Jewelry, Cartagena, Colombia) spoke to the authors about the Jewelry School of the Caribbean (FEJOCAR), a nonprofit organization that teaches at-risk youth the art of jewelry ...

JAS, ‘The Select B2B Show,’ with the continued theme “Connect to Source,” will be held from 5th to 7th July 2024 at JECC Sitapura, in Jaipur.

Aquamarine and heliodor are colored by Fe ions, an important coloring agent for beryl. Blue to yellow gem beryl was studied by quantitative spectroscopy and trace-element analytical techniques to ...

Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference ...

Reports on the geology, background, and current state of mining and production at Iran’s largest turquoise mine.

Diamonds from the Deep Gems & Gemology, Winter 2020, Vol. 56, No. 4 What Have Diamond Ages Taught Us? Karen V. Smit and Steven B. Shirey ...

Diamonds have a long history as a premier gemstone—a natural consequence of their beauty, rarity, and superlative physical properties such as extreme hardness. Diamonds that are mined for use as ...

GIA researchers analyzed more than 90,000 natural pink diamonds to better understand how these rare and beautiful diamonds formed and got their color.

GIA researchers report on a new nickel-diffusion treatment used to modify color in spinel and present criteria for identification.