Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading ...

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Twenty-six peridot samples from the Esquel pallasite meteorite and 27 samples from 10 terrestrial sources were studied by laser ablation–inductively coupled plasma–mass spectrometry (LAICP- MS). Among ...

Reviews the advancements and major trends in laboratory-grown diamonds observed by GIA since 2007. Gemological and Trace Element Characteristics of Cassiterite from Yunling, China Examines gem-quality ...

If you were born in the month of June, you are lucky enough to have three birthstones to call your own. June is one of only three months (the others are August and December) that has three birthstones ...

Blue diffusion-treated sapphires are becoming more prevalent than ever before. The diffusion technique, which involves the addition of color-causing chemicals during heat treatment, results in a thin ...

Birthstones are a fun, popular and colorful introduction to the world of gemstones. They appeal to audiences around the world regardless of gender, age, nationality or religion. Birthstones carry ...

Full 4Cs assessment with a plotted clarity diagram, and an assessment of growth type and post-growth treatment. The laboratory-grown diamond’s girdle is laser inscribed with the term "Laboratory-Grown ...

This selection of gems from Ouro Prêto, Brazil, and Russia's Ural Mountains, displays the golden orange to pinkish red color range of precious topaz. The gems range from 7.61 to 14.33 carats in size.

Found in nearly every color – most notably red, pink and blue – spinels are popular gemstones because of their abundance, moderate cost and attractiveness. Red spinel has often been mistaken for ruby.

Chow Tai Fook and GIA are discontinuing its pilot service, the GIA blockchain diamond grading report, on October 31, 2022. Clients with this report registered to receive it through the Chow Tai Fook T ...

Trio of carved green tourmaline dolphins on frosted quartz base. Carved by Gerhard Becker. Gift of John Staver, GIA Collection. Photo by Orasa Weldon. In 1972, an immense pocket of superb tourmaline ...