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Natural Emerald with Inclusions along Three Directions
COLORED STONES AND ORGANIC MATERIALS
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Gemological Study of Rubies from Longido,Tanzania
Rubies from Longido,Tanzania,were investigated by standard gemological testing and laser ablation inductively coupled plasma mass spectrometry.Microscopic observations revealed dense needle-like and triangular inclusions,distinct growth lines,and color banding as typical inclusions.
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Trapiche emerald from Swat Valley, Pakistan
Trapiche emeralds are usually found in Colombia. Recently the authors received six emeralds reportedly from Swat Valley, Pakistan.
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Recrystallization of baddeleyite as an indicator of PHT (“HPHT”) treatment in sapphire.
PHT (“HPHT”) treat- ment in sapphire has been a controversial topic the last few years. Recently, Guild Gem Laboratories in Shenzhen re- ceived a 7.11 ct blue sapphire for identification. The refractive index of 1.762–1.770 and hydrostatic specific gravity of 4.00 confirmed the stone’s identity.
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