the extra weight by which valuable stones and pearls tend to be weighed
- the system of dimension for the percentage of gold in an alloy; 18-karat silver is 75per cent silver; 24-karat silver is pure gold
- a device of weight for valuable stones = 200 mg
- The weight where valuable stones and pearls are weighed.
- A twenty-fourth component; -- a term found in calculating the proportionate fineness of silver.
A measurement unit determining the purity of silver. Pure gold is 24 carat, whilst 18 carat silver includes 18/24 gold and 6/24 alloy. Also spelt karat.
measure of fat for diamonds as well as other precious rocks, equivalent to three and one-sixth grains Troy, though split by jewelers into four parts called "diamond grains." Also a typical of fineness of silver, twenty-four carats being conventionally taken as expressing absolute purity, and also the percentage of silver to alloy in a mix being represented as many carats.
additionally karat, mid-15c., from center French carat "measure associated with the fineness of silver" (14c.), from Italian carato or Medieval Latin carratus, both from Arabic qirat "fruit associated with the carob tree," in addition "weight of 4 grains," from Greek keration "carob seed," additionally the name of a small body weight of measure (one-third obol), virtually "little horn" diminutive of keras "horn" (see kerato-). Carob beans had been a typical for weighing tiny quantities. As a measure of diamond fat, from 1570s in English. The Greek measure ended up being roughly the same as the Roman siliqua, that has been one-twentyfourth of a fantastic solidus of Constantine; thus karat took on a sense of "a proportion of 1 twentyfourth" and became a measure of gold purity (1550s). Eighteen carat silver is eighteen components gold, six components alloy. It is not likely that classical carat ever was a measure of fat for gold.
product of body weight for diamonds alongside precious stones, corresponding to 200 milligrams (4 jeweler's grains or 0.007 ounce) or around the extra weight of a small report video. One carat is divided in to 100 points (each add up to 2 milligrams): a 1.15 carat diamond, including, weighs one carat and 15 points (230 milligrams). Usually, a one carat brilliant-cut diamond has actually a diameter of approximately 6.5 millimeters or one-quarter of an inch. A ruby is denser, therefore smaller than a diamond of the identical fat. The carat, but is just the four aspects that determine the worthiness of a diamond, others three tend to be its quality, color and slice. Also called metric carat to distinguish it through the conventional carat which was equal to 207 milligrams. Spelled as karat in Germany.
African mines the diamonds are not only crystals of various weights from fractions of a carat to 150 carats, but also occur as microscopic crystals disseminated through the blue ground.