 |  |  |
| ||
| Home | | |
|
|
|
|
|||||
|
|
||||||
Examination of 23 tanzanites coated by an apparently new technique revealed that the smaller stones (4–5 mm) could be identified as coated based on a combination of the unusually intense color and microscopic examination, which revealed surface iridescence as well as wear on facet junctions (small areas where the coating was abraded away). The two larger (3+ ct) stones did not show iridescence or wear, only small clues with high magnification, and therefore were much more difficult to identify. EDXRF and LA-ICP-MS analyses showed the presence of Co, Zn, Sn, and Pb in the coating. |
|
|
Home | About GIA | Ethics Helpline | Education | Laboratory | GIA Reports | Research | Instruments & Books | Alumni Association Gems & Gemology | Employment at GIA | Careers Available | Newsroom | Publications | Library | Events & Trade Shows | Support GIA | GIA History | How to Buy a Diamond Contact | Search | Site Map | Help This page was last updated 07/17/08 05:24 PM Use of this site signifies your agreement to its terms of use. ©2002 - 2008 Gemological Institute of America Inc. GIA is a nonprofit 501(c)(3) organization. All rights reserved. World Headquarters and Robert Mouawad Campus 5345 Armada Drive, Carlsbad, California 92008 Tel: 760-603-4000 |