D-Colour Natural IIa Diamond with Walstromite Inclusion
A diamond is proven to have a superdeep origin through an inclusion of CaSiO3-walstromite.
Nephrite Bracelet with Filled Cavity
A jade bracelet contains unusual fillers, used to create a smooth surface.
IAC Conference on Responsible Gold
A report from the eighth annual International Gold Conference, held in New York on 12-13 April 2018.
Observation of Etched Surface Micro-Features on HPHT Synthetic Diamonds Using Laser Confocal Microscopy
Laser confocal microscopy, a very reliable method of revealing surface micro-features, is used on an HPHT synthetic diamond to reveal growth structures.
World of Gems Conference
A report from the fifth World of Gems Conference, held on 23-24 September at the Loews Hotel in Chicago.
The Foxfire Diamond, Revisited
The 187.63 ct rough diamond from Canada’s Diavik mine shows surprising reactions to ultraviolet light.
Interesting Growth Structure in Black Diamond
Observations on a black diamond with an unusual inclusion pattern lead to theories on growth.
GSA 2017 Annual Meeting
Experts shared the latest research on gemstones at the Geological Society of America annual meeting in Seattle.
Two Natural Type IIa Diamonds with Strong Phosphorescence and Ni-Related Defects
Natural diamonds exhibit characteristics normally seen in synthetic material.
Preliminary Observations on Facet-Grade Ruby from Longido, Tanzania
Microscopic observation and trace element analysis is performed on rubies from Longido.