Aquamarine with Unusually Strong Dichroism
This aquamarine's most striking feature was its unusually strong dichroism, displaying very deep blue and pale bluish green colours.
Unusual Faceted Massive Fuchsite
An unusually large faceted fuchsite, the chromian variety of muscovite, was identified and its green colour explained.
Unusual Epigenetic Malachite Discs in Quartz
The uncommon occurrence of epigenetic malachite, as found in this quartz, can result in vivid green colour.
Water Immersion Reveals Dye in Fire Opal
A simple test easily detected dye treatment in fire opal.
Coloured stones cut with high precision
At the AGTA and GJX shows, China Stone (Bangkok) marketed a selection of tiny, precisely cut natural gemstones.
Musgravite from Myanmar
Two small, near-colourless stones reportedly from Myanmar (0.11 and 0.24 ct; figure 1) were recently loaned to GIA for examination for identification.
Blue cat's-eye apatite
Deep blue apatite with a cat’s-eye effect, however, is very rare.