Rare Faceted Wurtzite
A stone submitted for identification is revealed to be the first wurtzite examined by the GIA lab.
A Repaired Diamond
A marquise-cut diamond is found to have been broken and reassembled with an unknown adhesive.
Large Faceted Afghanite
A report on the largest facet-grade afghanite seen in the GIA gem identification department.
Dyed Quartzite Imitation of Ruby-in-Zoisite
Beads appearing to be ruby-in-zoisite are revealed to be dyed quartzite.
Non-Nacreous Purple and White Pearls Reportedly from Spondylus Species
Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusc.
Synthetic Rock Crystal Quartz Bangle with Unusual Inclusions
A high-quality bangle with two-phase inclusions, similar to natural quartz is found to be synthetic material.
Unusual Coloured Stones
Six rarely seen gemstones are submitted as a parcel to the Carlsbad lab.
Separation of Black Diamond from NPD Synthetic Diamond
DiamondView is used to differentiate a Fancy black natural diamond from its NPD synthetic counterparts.
Largest Blue HPHT Synthetic Diamond
Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.
Fluorite Sphere with Phosphorescent Coating
A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.