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The GIA laboratory in Botswana recently examined an extraordinary pink-and-colorless bicolor rough diamond. Reportedly from the Karowe mine, the source of several notable diamonds, including the 2,488 ct Motswedi diamond, also examined by GIA, the 37.41 ct rough diamond has distinct colorless and pink sections, possibly indicating that the diamond formed at two different times. ‘It is generally understood that pink color in diamonds results from significant stress causing a change in the diamond’s crystal structure known as plastic deformation,” said Dr. Sally Eaton-Magaña, senior manager of diamond identification   ...  more
TECHNOLOGY
GIA Field Gemology Team Completes One-Hundredth Expedition
GIA field gemologists recently completed their one-hundredth expedition, adding to the Institute’s unrivaled store of independently verified gemological information from colored stone mining locales around the world. During this expedition to Kenya and Tanzania, the GIA team collected large parcels of tsavorite, spinel and sapphire rough,   ...  more
Registration Now Open for Converge 2025: A Historic Collaboration Between GIA and AGS
Registration for Converge, the singular gem and jewelry event combining the unique expertise of the American Gem Society (AGS) and the Gemological Institute of America (GIA), is now open. Industry professionals, including AGS members, can explore registration options and other key details for the   ...  more