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https://www.durangosilver.com/turquoisegrades.htm
Natural Turquoise (not High Grade, but standard jewelry grade): Standard natural Turquoise is the next highest of the Turquoise Grades. Standard natural Turquoise is what most mid-range to high end production jewelers use. These Turquoise Grades are rated by AA-, A, B and C. These are the Turquoise Grades that were most common to see during the early years of the Turquoise boom in …
https://www.gia.edu/turquoise-quality-factor
Fine-quality turquoise is sought after around the world by designers of unusual jewelry pieces. Typically, turquoise is judged on three basic quality factors—color, texture, and the presence or absence of matrix. Turquoise Color. Blue Turquoise
https://www.durangosilver.com/highgradeturquoisejewelry.html
It is even rarer to see High Grade Turquoise jewelry or even good Quality Turquoise Jewelry. Good quality jewelry uses B+ to A Grade Turquoise, which can be stabilized or natural. High Grade Turquoise Jewelry uses AAA and when available on ultra rare occasions AAAA grade Turquoise in handmade silver and gold settings.
https://tskies.com/blogs/news/what-is-the-turquoise-matrix
Jun 30, 2015 · Pure turquoise no matrix: +4 Little matrix: +1 Good solid matrix, no pattern: +2 Good matrix, premature patterning: +3 Rare patterns: +4 Exaggerated rare patterns: +5 The Spiderweb Pattern The spiderweb pattern has been generally accepted by most in the turquoise industry as the most valuable pattern.Author: Anna Oliver
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