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A face-up view of a cushion cut diamond with blue color.
Article
Gems & Gemology’s 7 Most Unusual Encounters from 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

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Article
Jaipur, India: The Emerald Cutting and Trading Powerhouse

Jaipur, India, is a leading emerald cutting and trading centre for the global gem and jewellery industry. See inside the industry with a GIA field team, and learn the intricacies of a business seldom seen by the public or most members of the industry.

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Article
Living ‘Miracle to Miracle’: Gemmologist Reflects on 30 Years in the Colombian Emerald Trade

Graduate’s fascination with gems began in GIA’s warehouse and put him on a fast track to becoming an expert on Colombian emeralds.

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Large Fluorite Sphere
Fluorite Sphere with Phosphorescent Coating

A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.

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Faceted Cobalt-Diffused Spinel and Polished Plate Samples
Article
GIA Lab Reports on a New Cobalt Diffusion Treatment of Natural Spinel

Report on a new cobalt diffusion treatment of natural spinel, using analysis of inclusions, UV-Vis-NIR and EDXRF spectroscopy, and LA-ICP-MS.

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Article
Insights From Inclusions

Natural gemstones are typically far more valuable than synthetic ones, so being able to identify them correctly is a powerful skill.

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Turquoise with Fingerprint Pattern

A fingerprint pattern, possibly left by human skin oils during the assembly process, is observed in natural turquoise beads.

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Water Immersion Reveals Dye in Fire Opal

A simple test easily detected dye treatment in fire opal.

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Green Sapphire Filled with Glass

Analysis reveals blue lead glass filling in a sapphire that has an overall green bodycolour as a result of the filling’s combination with natural yellow colour.

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Orangey Pink Coated "Soft Coral"

A coral specimen that was coated - not dyed - with a colouring agent only on the surface, an unusual method evidenced by microscopic features.

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