Pennyweight

A unit of mass equal to 24 grains or one-twentieth of a troy ounce, commonly used to weigh precious metals.

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Grain (unit): A unit of mass equal to 64.79891 milligrams, used in systems including troy and avoirdupois measures. Twenty-four grains make one pennyweight.
Gold: A dense, chemically resistant metallic element valued for jewelry, coinage, and electronics. Pennyweights commonly express the mass of gold in jewelry and bullion.
Penny: A small-denomination coin used in several currencies, historically also serving as a unit of account. The pennyweight's name derives from the weight of an English penny.
Ounce: A unit of mass whose value depends on the measurement system in which it is used. An unqualified ounce may mean avoirdupois rather than the troy ounce behind pennyweight.
Troy ounce: A unit of mass equal to 480 grains, used chiefly for precious metals. A pennyweight is one-twentieth of this ounce.
Goldsmith: A craftsperson who makes or repairs objects from gold and other precious metals. Goldsmiths may weigh metal stock and finished pieces in pennyweights.
Sterling silver: A silver alloy containing 92.5 percent silver by mass, traditionally used for coinage and silverware. Historical accounts connect the pennyweight with the weight of a sterling silver penny.
Metric system: A decimal measurement system based on units such as the gram and kilogram. Metric weights provide a decimal alternative to pennyweight's traditional grain-based scale.
Troy weight: A system of mass units traditionally used for precious metals and gemstones. Pennyweight belongs to this system of measurement.
Jewelry: Decorative objects worn on the body, often made from precious metals or gemstones. Pennyweights can state the precious-metal content of jewelry.