In ancient times, the particles of various plants were mainly used as a unit of mass for jewelry. Today we use more convenient names, but even the word "carat" comes from the name of the carob tree, the seeds of which are also used to determine the value of stones or pearls.
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What is a carat?
So there is an international treaty, called the Metric Convention, which is currently signed by 55 industrialized and commercial nations. This agreement ensures the constancy and uniformity of measurement standards, in which the carat is used as the unit of measurement for the quality of a gem or pearl.
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When measuring the mass of a gemstone, how much does 1 carat weigh?
According to the reference, one carat is equivalent to 200 milligrams (0.2 grams). At the same time, in most countries (including Russia), the carat cannot have a fractional part, and the weight of the raw material or product is expressed as a whole number.
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outdated carat
The names "English carat" and "Arabian carat" (aka "kirat") can also be found in literary and scientific writings of the past.
Until 1888, Britain and its colonies used an English carat (about 205.4 grams), which weighed about 3.170 troy grains, which was equivalent to the weight of an average barley grain.
Arabic carat is defined differently in different countries in the Middle East and Asia. For example, it is about 195 mg in Egypt and Syria and 204 mg in Asia Minor.
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gold carat
Our compatriots are often confused by the fact that gold in many Western countries is measured in carats. Indeed, how is the proportion of metal in a product determined by the unit of weight?
In fact, everything is simple. Like our familiar samples, carat determines the proportion of pure gold in the alloy, or rather, its 24 weight fractions. Converting a sample to carat is as simple as multiplying the existing value by 24 and dividing by 1000. For example, to convert the 585th sample to carats, we use a simple formula:
X u003d 24 × 585: 1000 u003d 14 carats (585th sample corresponds to 14 carats)
Likewise, you can convert carats to samples:
X u003d 1000 × 18: 24 u003d 750 samples (18 carats corresponds to the 750th sample).
Most common gold alloys (carats and samples)
- 24 carats = 999 proof = 100% gold alloy
- 18 carats = 750 fineness = 75% gold in the alloy
- 14 carats = 585 fineness = 58.5% gold in alloy
- 12 carats = 500 gauge = 50% gold in alloy
- 9 carats = 375 fineness = 37.5% gold in alloy
- 8 carats = 333 fineness = 33.3% gold in alloy
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