Pricing and valuation
The ranchers say in my land "Anyone who does not know, is how he saw no" and have quite rightly can be standing on top of a gold mine and whether it is not known because you never know, that this was stopped on a gold mine, and mine is not discovered.
* Flawless or nearly flawless topaz rough widely available; don't accept a stone that is visibly included.
* Reds, intense pinks or violets are rarest, most expensive (reds $300-$1000/carat; pinks $100-$500/carat in 1-5 carat sizes)
* Imperial topaz of a very intense orangish-red next most expensive ($100-$400/carat in 5 carat sizes; $50-$200 in 1-2 carat sizes)
* Yellow to yellow-brown is common, less than $50/carat
* Blue, particularly deep blue ("London blue"), extremely popular, common; has replaced aqua. as the "inexpensive" blue stone of choice because it costs considerably less. Recent wholesale prices for 3 carat gemstones:
o Sky Blue - $0.75-1.50/carat
o London Blue - $3-4.50/carat
o Super Blue - $3.50-10.00/carat
* Some treated stones (particularly the expensive reds, pinks, violets and deep oranges, but not blue) are known to fade with prolonged exposure to direct sunlight.
As you saw stones treated who come mainly from Brazil lose their color with the sunlight, on the other hand these figures are from 1988 on eBay there are fresh data, this link in the sidebar (sidebar).
Este es el Link a ;La Universidad de Texas en Austin,el Jackson School of Geosciences;da estos precios
Aquí esta la dirección;http://www.geo.utexas.edu,para que no pierda usted el tiempo,al llegar a la página de inicio( La Portada)ponga simplemente en la caja de búsqueda;topaz valuation.