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Title
G&G Lab Notes.
Abstract
The article presents several rare gemstones identified at the laboratory of Gemological Institute of America (GIA) in Carlsbad, California. It states the diamond with radiation halo inclusion. It notes the emerald double with very flat separation plane below girdle that crosses pavilion diagonally. It mentions the hydrophane opal with whitish, cloudy appearance and appeared brown in calibrated diffused light.