Because there are no universally accepted grading systems for hue, tone and intensity of color, experts will use descriptive words when trying to describe the color of both the most common and the rarest colored stones. For example, sapphire, a variety of the mineral species called corundum, grows in every color of the rainbow except red. In the variety of blue sapphire, the most common stones are either too pale or too dark. The rarer sapphires exhibit a vivid, bright blue with no black, gray or green. Nature produces greater quantities of the paler and darker sapphires. So when we discover the vivid, bright blue stones, the cost rises sharply because of their comparative rarity. These principles of common versus rarer color are true for all colored stones.
Cost is important but not the only factor to consider when selecting a stone. When we present blue sapphires, for example, we show stones in a wide range of blues, and then focus on the specific shade that most pleases the customer. This means presenting everything from the rarer blues to the more affordable navy or deep sky blue sapphires.
Jun 25, 2017 | TOM TIVOL
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