Origin of the cat’s eye effect in heat-treated zircons from Sri Lanka
Origin of the cat’s eye effect in heat-treated zi […]
Grenats – une famille de gemmes multicolores
Grenats – une famille de gemmes multicolores. Pub […]
Granate – eine farbenfrohe Edelstein-Familie
Granate – eine farbenfrohe Edelstein-Familie. Pub […]
Garnets – a colourful gemstone family
Garnets – a colourful gemstone family. Published […]
Untersuchungen an Titanit, einem für Sri Lanka neuen Edelstein
Untersuchungen an Titanit, einem für Sri Lanka neuen Ed […]
Ferroaxinite – another new gem from Sri Lanka
Ferroaxinite – another new gem from Sri Lanka. Pu […]
Blue colour-changing kyanite from East Africa
Blue colour-changing kyanite from East Africa. Publishe […]
First occurence of gem sphene in Sri Lanka
First occurence of gem sphene in Sri Lanka. Published i […]