Peer-reviewed articles -

From Spuds to Sparkle: Idaho has Almandine Garnets

An interesting new commercial chapter for a distinctly American gemstone.

Characterisation of Almandine from Idaho, USA, Journal of Gemmology 2026, Vol 40 (3): 219-221

Author: Charles Evans FGA DGA

Danburite is hardly an everyday gemstone, but this particular example managed to make an uncommon gem somewhat more unusual.

Chatoyant Danburite from Sri Lanka, Journal of Gemmology 2026, Vol 40 (2): 116-117

Author: Charles Evans FGA DGA

The briefest exposure to a UV lamp immediately altered the colour of this synthetic sapphire.

Ni-bearing Synthetic Sapphires Showing Irreversible Photochromism, Journal of Gemmology 2025, Vol 39 (7): 629-631

Authors: Sean O’Neal, Charles Evans FGA DGA, Guy Borenstein FGA

No-one had ever looked at faceted phenakite from the type locality before.

Phenakite from Volodarsk-Volynski, Ukraine, Journal of Gemmology 2024, Vol 39 (3): 209-210

Author: Charles Evans FGA DGA

There is “rare” and then there are “one-offs”. This Aeschynite was a true “one-off”.

Faceted Aeschynite-(Y) from Afghanistan, Journal of Gemmology 2024, Vol 39 (1): 6-7

Author: Charles Evans FGA DGA

A single item of jewellery – multiple skilled tradespeople – everyone earning living.

Article: Rebrand to Restart, Journal of the Gemmological Association of Hong Kong 2020, Vol XLI: 94-95

Author: Charles Evans FGA DGA

Mining is prohibited, but this was a sample for science.

‘Black Anorthoclase’ from Antarctica, Journal of Gemmology 2019, Vol 36 (5): 402–403

Authors: Brendan M Laurs FGA, Charles Evans FGA DGA, Pat Daly FGA, Nathan Renfro FGA