Blue Chart Gem Identification
Natural / Treated / Synthetic / Imitation
Edition 2015

   The gem identification tables present 144 minerals and are organized by refractif index. With indication of groups, species, sub-species and varieties, refractif index, refractif index range, birefringence & doubling, chrystal system, optic character & sign, specific gravity, specific gravity range, and hardness.
The description of distinctif characteristics, typical inclusions and common treatments, help to eliminate all possibilities but one. They also give you hints which properties to test in order to double check the result.
A description of pleochroism
79 color absorption spectrums as seen with a quality diffraction grating spectroscope. A very quick way to identify the nature of several color stones.
Last but not least the specific gravity, combined with the optical properties are very helpful to identify rough stones or sometimes double check cut stones.
Order here for CHF 58.- plus shipping.

Order here

Hubert Heldner       Avenue des Alpes 70   C.P. 1261       CH-1820 Montreux
Fax +41(0)21 963-8978     Phone +41(0)21 963-8977

Franšais
Deutsch



Artists
Collection
Education
Mineralshows
Publications
Tools


Contact


Links
Back to Home