Keywords -CT (carat):
CT refers to carat, and 1 carat is equal to 0.2g or 200mg Because the density of gems is basically the same, the heavier a gem is, the larger its volume is.
Carat (Ct) is the unit of mass (weight) of precious stones. One carat is divided into 100, such as 50 cents, or 0.5 carat, which is used to calculate smaller gems. Because the density of gems is basically the same, the heavier the gem, the bigger the volume. The bigger the gem, the rarer it is, and the higher the value per carat.
Diamonds weighing less than 1 carat are usually measured in "points", 1 carat = 100 carat. On the certificate of diamond, the weight of diamond is accurate to the third decimal place. IGI uses an electronic balance with an accuracy of 0.0000 1 carat to weigh the accurate weight of diamonds, and records it in the diamond appraisal report, accurate to two decimal places.