In the early 2000s, a new variety of red or green gemstone resembling sunstone and known as "Andesine" appeared in the gem market.
 After much controversy and debate, most of these gemstones, allegedly sourced from China, were subsequently discovered to have been artificially colored by a copper diffusion process.
A Tibetan source of bona fide (untreated) red andesine, however, was eventually verified by a number of independent groups of well-respected gemologists.
In the early 2000s, a new variety of red or green gemstone resembling sunstone and known as "Andesine" appeared in the gem market.  After much controversy and debate, most of these gemstones, allegedly sourced from China, were subsequently discovered to have been artificially colored by a copper diffusion process. A Tibetan source of bona fide (untreated) red andesine, however, was eventually verified by a number of independent groups of well-respected gemologists.
Sunstone