How do you value a gem? One factor in valuating gems is its weight. Gem weight is measured and valued in carats. One metric carat equals 0.2 grams (.007 ounces). The word carat comes from carob, a Mediterranean tree whose seed was for centuries the standard for weighing precious stones. The price depends on that particular gem on the open market.

There are certain properties that will influence the price. The gem is worth more if it is natural versus synthetic. The natural color and how the coloring is distributed throughout the stone in important. If the stones have any flaws or inclusions, that could affect the durability of the stone, the value will decrease.

The three main factors on the quality of a gemstones are color, clarity, and color. Color should be determined under normal daylight, fluorescent, and incandescent to notice if there are any changes. The clarity of a gem can be determined by eye examination and by using a 10X magnifier to notice any inclusion or blemishes by looking at all angles of the gemstone. The cut of the stone is determined by its beauty, appeal, and symmetry.

The price of the gem increases or decreases in value depending on how a jeweler arranges the gem on a ring, earring, bracelet or necklace.