Multi-Elemental Diffused and Melt-Grown Synthetic Sapphire
GIA examines a multi-elemental diffused and melt-grown synthetic sapphire for the first time.
Pink Sapphire Filled with Bismuth-Based Glass
A sapphire with a color not commonly seen in the lab is found to have a glass filling.
HPHT Synthetic Diamond Melee Without Si or Ni Defects
Quality assurance testing in the Bangkok lab reveals HPHT synthetic melee in larger sizes.
Three Faceted Collector Specimens
Three mineral species, not previously seen in the Carlsbad lab, are examined.
Unusual Dark Orangy Red Cordierite
A cordierite with a color not seen in the GIA lab is examined in New York.
Cape Diamond with Yellow Phosphorescence
First Observation of H4 Defect in CVD Synthetic Diamond
Paraíba Tourmaline with Unusual Coating
A coated Paraíba tourmaline is seen for the first time at a GIA lab.
Rubellite with Incredibly Strong “Pink Sleeves”
Radiation-induced pink sleeves are seen in a rubellite cabochon.
HPHT Synthetic Diamond with Intense Green Color
Nickel is found to contribute to the color of a synthetic diamond seen in the New York lab.