Emeralds and the Saga of Cleaning and Filling Fissures
There is a long established tradition in the trade to fill open fissures in emeralds with colourless fillers, such as oil, wax and (artificial) resins, to reduce their visibility. Disclosure of such treatments is mandatory (CIBJO), including a quantification of the filler substance, as this may have a direct im
The Beryl Group – an Overview
The Beryl Group – an Overview. Published in Journal of […]
Gemmological investigations on pearls and emeralds using neutron imaging
Gemmological investigations on pearls and emeralds usin […]
Emeralds and the saga of cleaning and filling fissures
Emeralds and the saga of cleaning and filling fissures. […]
Case study on an emerald bead: Is it from the ancient mines in Egypt or not?
Case study on an emerald bead: Is it from the ancient m […]
Colourful Treasures of Nature: Ruby, Sapphire, Emerald & Pearls (2012)
2012 Christie’s expert lecture by Dr. Michael Krzemnicki on exceptional coloured gemstones and natural pearls.
Asterism in beryl, aquamarine and emerald- an update
Asterism in beryl, aquamarine and emerald- an update. P […]
Der Binntal Smaragd als Juwel
Der Binntal Smaragd als Juwel. Published in Schweizer S […]
Les nouvelles mines d’émeraudes de la Pita (Colombie)
Les nouvelles mines d’émeraudes de la Pita (Colom […]
Emerald treatments: their effects and how to recognize them
Emerald treatments: their effects and how to recognize […]