Gemworld International, publisher of The Guide, has just released its latest update for all gemstone treatments and pricing grids, showing how the treatments affect value. Pricing grids include differences between natural gems and those that have been enhanced. In the case of emerald enhancement, prices can even vary depending on how much enhancement is noted.
Included with the new update is a comprehensive list of more than 75 gemstones and gem varieties, their possible enhancements, if or how the enhancements can be detected, and how prevalent the enhancement. There are also notes on stability and care of enhanced gems.
The new updates are only for subscribers to The Guide.