 |  |  |
| ||
| Home | | |
|
|
|
|
|||||
|
|
||||||
Surface-treated topaz has become a viable alternative to topaz colored by irradiation. Unlike irradiation, which modifies the entire gemstone, coloration by chemical modification is limited to the near-surface region. The treatment techniques are well established, but less is known about how the processes involved create the desired appearance. In this study, X-ray photoemission spectroscopy in combination with sputter depth profiling proved successful in characterizing two fundamentally different coloration mechanisms of chemically treated topaz: colored coatings and diffusion-induced coloration. |
|
|
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 |