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

Sapphire, rough and faceted, from the Rock Creek deposit in Montana has become one of the pillar gems of American origin in the global colored gemstone market. Over the past 10 years, Potentate Mining ...

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.

Documents Namak Mandi’s transformation from a salt market to one of Pakistan’s primary gem trading centers, with a look at the commercial activities taking place today.

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 ...

Analyzes a group of 23 freshwater “Edison” pearls (a trade name referring to near-round freshwater cultured pearls, usually shell bead cultured) using various gemological and advanced instrumental ...

A chemical and spectroscopic comparison of two purple gem spinel samples, one of them the first reported example of a spinel with a saturated purple color caused predominantly by chromium and cobalt.

Diamonds from the Deep Gems & Gemology, Summer 2019, Vol. 55, No. 2 Kimberlites: Earth’s Diamond Delivery System Karen V. Smit and Steven B. Shirey ...

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 ...