◂ BACK TO GEM ENCYCLOPEDIA
Amber
Amber is nature’s time capsule. This fossilized tree resin contains remnants of life on earth millions of years ago.
See Gem As
Tools
Research
Topaz Description
Topaz actually has an exceptionally wide color range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. Colorless topaz is plentiful, and is often treated to give it a blue color
Topaz Care and Cleaning Guide
Learn about topaz's durability and how to care for your topaz jewelry.
Finds from the Secondary Market
Dave Bindra shows some noteworthy pieces he obtained on the secondary market and shares his thoughts on the state of the colored stones market.
Spray of Columbite Crystals in Topaz
A cluster of bladed columbite crystals is identified in colorless topaz.
Winter 1995 G&G; Lab Notes
This section, from the Winter 1995 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.
Fall 1987 Gem News International
A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.
Summer 1987 G&G; Lab Notes
This section, from the Summer 1987 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.
The Radioactive Decay Pattern of Blue Topaz Treated by Neutron Irradiation
A systematic study of 15 neutron-irradiated blue topaz samples was conducted using high-purity germanium (HPGe) digital gamma-ray spectroscopy.
Summer 1998 Gem News International
A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.
Abstracts; Summer 2010
Coloring of Topaz by Coating and Diffusion Processes: An X-Ray Photoemission Study of What Happens Beneath the Surface
Surface-treated topaz has become a viable alternative to topaz colored by irradiation.
