Large Faceted Afghanite
A report on the largest facet-grade afghanite seen in the GIA gem identification department.
A Repaired Diamond
A marquise-cut diamond is found to have been broken and reassembled with an unknown adhesive.
Dyed Quartzite Imitation of Ruby-in-Zoisite
Beads appearing to be ruby-in-zoisite are revealed to be dyed quartzite.
CVD Synthetic Diamond Over 5 Carats Identified by GIA
Results from GIA’s recent testing of a 5.19 ct CVD synthetic diamond, the largest it has examined to date.
Non-Nacreous Purple and White Pearls Reportedly from Spondylus Species
Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusc.
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.
Unusual Coloured Stones
Six rarely seen gemstones are submitted as a parcel to the Carlsbad lab.
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.
Polished Freeform Topaz Imitating Diamond Rough
Material submitted as a rough diamond is revealed through gemmological testing and analysis to be a near-colourless topaz.