Conversion relationship: 1 carat (CT) = 0.2g (g), 1 carat = 100 minutes. For example, 0.80 carat is 80 minutes, which is 0. 16 grams.

Origin of the name: Kela, also known as Ka and Kara, abbreviated as "ct" in English, is internationally used. Since 1907 was internationally recognized as a gem measurement unit, it has been used to this day. It is the quality unit of pearls, diamonds and other precious stones. ?

Kela originated from the Greek word "keration", which is a plant widely spread from East Asia to the Middle East. Because it is said that its fruit weight is almost the same (equal to 205.3 mg), the early carob tree was used as a unit of weight for jewelry and precious metals, and one carat is equal to the weight of a carob seed. ?

"Minute" is a convenient name for merchants. It is always inappropriate to read the weight at the beginning of zero, so how many "minutes" are said, and the weight is still marked with carats on the appraisal certificate. ?

The weight of diamond is the most easily measured characteristic in 4c. It is weighed by various scales with the accuracy of 0.000 1g using standard weighing instruments. As long as you follow the operating rules, you can get accurate results. In business, the carat quality of diamonds should be marked to the second place after the decimal point, and the rule that the third place after the decimal point is nine into one is implemented, and the numbers below 8 are ignored. For example, the weight is 0.898ct, which is only 0.89 CT； when pricing; If the weight is 0.899ct, it can be priced at 0.90ct, which is different from the usual "rounding".