Weights & Numbers & Measurements-For-Jewelry
The jewelry industry uses a confusing array of measurements-for-jewelry and to describe it to the public. A buyer interested in gemstones and precious metals must be able to decode the jewelry speak to understand what it is they are buying.
Measurements-for-jewelry of weight and size often plays an important part in determining the price that a piece of jewelry is offered at. For example, one of the 4 C's of gemstone and diamond evaluation--cut, clarity, carat, color--is the weight measurement carat.
To confuse matters, a similiar word--karat is not a measurement of weight at all, but describes the percentage of gold in the gold alloy used.
An ounce used in jewelry speak is a different ounce than the one we use commonly in the United States. Twelve troy ounces makes up a troy pound while sixteen avoirdupois ounces make an avoirdupois pound. Yet, both sets of numbers are used in weighing metal--troy ounces to measure precious metals (gold, silver, platinum) and avoirdupois ounces to measure base metals.
Metric measurements are the most commonly used numbers in the jewelry trade. However, American Standard weights and measures are used often as an alternative to the metric system or in conjunction with it.
How Much Gold Is In That Jewelry. . . Gold Karats & Measurements
Measurements-For-Jewelry: Carats & Gemstone Size
Measurements-For-Jewelry: Mohs Scale of Hardness for Rocks, Minerals & Gemstones