Dyed Yellow Beaded Freshwater Cultured Pearls Imitating South Sea Cultured Pearls
A yellow cultured pearl necklace is compared to the work of a producer specializing in freshwater pearls of all colors.
Sapphires from Northern Ethiopia
A new source of sapphires is found in the Tigray region of Ethiopia.
Tri-Color-Change Holmium-Doped Synthetic CZ
A synthetic cubic zirconia shows a surprising color change combination under different light sources.
“Sango Pearl” from Japan
A study of a pink Japanese akoya cultured pearl yields information about the material’s color origin.
Colorful Chatoyant Glass
A devitrified glass reminiscent of Victoria Stone is seen during the Tucson gem shows.
Chalcedony Beads Coated With Titanium Nitride
Beads in an necklace show a metallic appearance not seen in chalcedony.
New Deposits of Gem-Quality Common Opal from Michoacán, Mexico
Material from a new opal deposit in Morelia, Mexico is examined.
Raspberry-Red Garnet with Black Core
Chemical analysis is performed on the black core of a red grossular garnet crystal.
Tektite with a Large Fluid Inclusion
A large tektite found in northern Vietnam is examined in GIA’s Bangkok laboratory.