Gemological and Chemical Characteristics of Natural Freshwater Pearls from the Mississippi River System
GIA had the unique opportunity to study the gemological and chemical characteristics of 854 natural freshwater pearls from the Mississippi River system.
The Effect of Low-Temperature Heat Treatment on Pink Sapphire
Twelve pink sapphires undergo low-temperature heat treatment and reveal a correlation with the 3232 cm-1 FTIR peak.
A Special Type of Trapiche Quartz
Three incomplete trapiche quartz make up this interesting sample.
Tagua Nut as a Sustainable Botanical Alternative for Ivory
Jewelry designer Alexandra Mor uses sustainable alternatives for elephant ivory.
Plume Agate from Iran
Two varieties of colorful plume agates, characterized by inclusions resembling clouds of smoke, are sourced from Iran.
Glass-Filled Polki-Cut CVD Synthetic Diamonds
India’s Gem Testing Laboratory (GJEPC) encounters glass-filled CVD synthetic diamond polkis for the first time.
Nathan Renfro Wins Royal Microscopical Society Award
Regular G&G contributor receives award for his work in the field of gemology.
Ornamental Jadeites from the Levoketchpel Deposit in the Polar Urals of Russia
Gemological and trace element chemical characteristics of ornamental jadeites from the Levoketchpel deposit in Russia are compared with other sources.
Rubies from Rock Creek, Montana
A study on American ruby and sapphire from Rock Creek, Montana, unveils a few geochemical mysteries.