![]() ![]() The purity or color saturation is less easy to understand, but no less important. Thus a rich cornflower blue color in sapphire is more valuable than an inky blue-black or a pale blue. Gems that are too light or too dark are usually less desirable than those of medium tone. Ideal colors vary by gem variety, but generally the colors that are most highly valued are intense, vivid and pure. In the world of colored gemstones it is color that is the single most important determinant of value. Low quality sapphire can be quite inexpensive, while high quality amethyst can be pricey. But while the gem variety sets a general price range for a stone, the characteristics of the specific gemstone also have a major effect on the price per carat. Other varieties, such as many types of quartz, are abundant and prices are much lower. Some gemstone varieties - such as ruby, sapphire, emerald, tsavorite and demantoid garnet, tanzanite, spinel and alexandrite - command a premium price in the market, due to their superior gemstone characteristics and rarity. Here is a brief summary of the main factors that determine gem prices: 1. Many factors influence the price per carat. But don't confuse carat, a measure of weight, with karat, a measure of gold purity. The price per carat of gemstones can varies enormously, literally from pennies a carat to tens of thousands of dollars. One gemstone carat is 200 milligrams, so there are 5 carats to the gram. Most gemstones are priced according to weight, on a per carat basis. ![]()
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