News

Spiral structure in a Colombian emerald
Coloured glass coating of quartz beads before the 13th century: An undocumented sapphire imitation
Publication

Coloured glass coating of quartz beads before the 13th century: An undocumented sapphire imitation

Read
Laboratory Alert! Melee-sized HPHT Treated Yellow Diamonds appear in the Market
Publication

Lab Alert! Melee-sized HPHT Treated Yellow Diamonds appear in the Market

Read
Fibro-radiated crystallisation of Willemite Zn2SiO4 coloured by cobalt on the surface of a glaze
Micrographs, Publication

Fibro-radiated crystallisation of Willemite

Read
Inclusions de cinabre dans une opale éthiopienne
Publication

Cinnabar Inclusions in Ethiopian Opal

Read
Une coupe ethiopienne en corne de rhinoceros
Publication

An Ethiopian cup in rhinoceros horn (1/2)

Read
Coupe éthiopienne en corne de rhinocéros
Publication

An Ethiopian cup in rhinoceros horn (2/2)

Read
An exceptional 9.89 carats photochromic zircon
Publication

An exceptional 9.89 carats photochromic zircon

Read
A jewel with a large number of flux-grown synthetic rubies
Publication

The unusual case of a jewel with a large number of flux-grown synthetic rubies sold as natural rubies

Read
The heat treatment of corundum at Moderate temperature
Micrographs, Publication

The heat treatment of corundum at Moderate temperature

Read
Precious corals, C. rubrum, P. elatius, C. japonicum, C. konojoi, H. laauense, Coll. SGDF, Photograph M.Rondeau
Publication

Review and update of the classification of precious corals.

Read
New Large Black Synthetic Moissanite as a Black Diamond Imitation
Publication

New Large Black Synthetic Moissanite as a Black Diamond Imitation

Read
Melee-sized coloured sapphires
Publication

Efficiently Testing Melee-Sized Coloured Stones

Read