The trade of turquoise spans history and cultures, yet what defines a high-quality turquoise stone remains ambiguous, lacking a standard similar to the Four Cs for diamonds.
Jacob and Joe Dan Lowry have been working for five years to establish a grading system intended to create clarity and consistency within an industry that currently lacks accepted standards.
High-quality natural turquoise is rare, with some stones from classic mines now selling for 25 to 30 times their price from 25 years ago, reflecting rising demand and scarcity.
Preferences in turquoise quality vary by region and evolve over time, with collectors often seeking stones from specific, now mostly defunct, mines that produce distinct and valued varieties.
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