Full version Gemstones: Quality and Value, Volume 1 For Free
- 3 years ago
https://ironman434.blogspot.com/?book=4418999027
Introduces a system for judging the quality of gemstones that is powerful enough for professional and the layperson. Specific information about mining, treatments, sources, and quality and value are analyzed for each of these 24 types of gemstones through a system of "quality scales" developed by the author.
Introduces a system for judging the quality of gemstones that is powerful enough for professional and the layperson. Specific information about mining, treatments, sources, and quality and value are analyzed for each of these 24 types of gemstones through a system of "quality scales" developed by the author.