1 2 The unit of weight for a diamond or other gemstone and also for a pearl, equivalent to 200 mg Standard to define the fineness of gold and gold alloy, expressed as a number out of 24 parts, e g 14 carat means 14/24ths gold in the alloy 24 carat gold is pure gold Most jewellery uses gold of 14 of 18 carats For convenience, the fineness of gold may be expressed in thousandths rather than carats: - 24 carats = 1,000 thousandths (1 000), - 18 carats = 750 thousandths (0 750), - 14 carats = 583 thousandths (0 583), - 12 carats = 500 thousandths (0 500)
A carat is a unit for measuring the weight of diamonds and other precious stones. It is equal to 0.2 grams. The gemstone is 28.6 millimetres high and weighs 139.43 carats. a huge eight-carat diamond
Originally a unit of mass (weight) based on the Carob seed or bean used by ancient merchants in the Middle East The carat is still used for the weight of gem stones where 1 carat = 200mg For gold is is used to measure the purity where pure gold is 24 carats
A value out of 24 used to describe the purity of precious metal For example, 24 carat gold is pure gold, 22 carat is 91 67% pure and 18 carat is 75% gold and 25% of some other metal such as silver or copper
Approximately 205 milligrams, or about the weight of the seed of the carob-tree which, being remarkably consistent, was used for measuring the weight of precious stones from earliest times Pure Gold is described as 24 carat; 18 carat gold will be 75% gold and 25 carat gold is a hardening alloy
Abbreviated "ct " and spelled with a "c" is a measure of weight used for gemstones One carat is equal to 1/5 of a gram (200 milligrams) Stones are measured to the nearest hundredth of a carat A hundreth of a carat is also called a point Thus a 10 carat stone can be called either 10 points, or 1/10 of a carat Small stones like 05, and 10ct are most often referred to by point designations Note that karat with a "K" is a measure of the purity of a gold alloy A one carat round diamond of average proportions is approximately 6 5mm in diameter Note that this relationship of weight and size is different for each family of stones For example ruby and sapphire are both heavier than diamond (technically, they have a higher specific gravity, so a 1 carat ruby or sapphire is smaller in size than a on carat diamond See Weights and Measures of Gold, Silver and Precious Gems for more information
A unit measurement of weight used for precious gemstones 1 Carat = 0 2 Gram (The term carat is derived from the ancient carob seed from the locust tree, used as a medium of exchange on early pan-balances In the early 1900's the metric carat was established )
A unit of weight denoting the size of both uncut and cut gemstones There should be 100 points to a carat (ct ) The newcomer to diamond buying should be careful not to become so influenced by carat size that he or she ignores or fails to recognize the importance of such points as clarity, color, and cut