Colored Stones and Pearls
New Technologies and Techniques
Diamond Identification
General Gemology and Jewelry
Cleavage System in Pink Diamond
A Fancy Intense purplish pink diamond with a network of planar cracks and strain-induced bodycolor reveals an aesthetic geometric pattern.
Quarterly Crystal: Molybdenite Phantoms in Quartz
Raman analysis identifies unusual inclusions in quartz.
Futurescape Forum
A recap of the Futurescape Forum panel from GIA’s 2018 International Gemological Symposium.
Diamond Geology
Diamond Identification
Gem Characterization
In Memoriam: Alan Hodgkinson (1937–2024)
In Memoriam: Glenn Lehrer (1953–2024)
Jade Forms from Ancient China
Trapiche Tourmaline from Zambia
Well-formed crystals of green tourmaline from northwestern Zambia show a growth pattern reminiscent of trapiche emerald/ruby when sliced perpendicular to the c-axis.
An Era of Sweeping Change in Diamond and Colored Stone Production Markets
The diamond, colored stone, and pearl businesses have witnessed unprecedented change since the turn of the 21st century.
Natural Shell Blisters and Blister Pearls: What’s the Difference?
GIA researchers explore the differences between whole, blister, and shell blister pearls in this study using 33 samples from Pinctada maxima mollusks recovered off Broome, Australia.
Radioactive Green Diamond
深入探寻 2013 年图森展
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