A carat is a measurement of diamond weight.
From Amazon.com:
"Carat is the unit of measurement used to describe the weight of diamonds. One carat is equal to 0.2 grams, or 0.007 ounces (avoirdupois). Five carats equals 1 gram, and 141.7 carats equals 1 ounce."
Three carat diamonds weigh three carats: that's how 'big' they are.
Carat is a weight, so its weight is one tenth of a carat or one tenth of .20 grams.
A one-third carat diamond weighs one-third of a carat. If the stone is a round brilliant cut stone, it's diameter measurement at the girdle will be about 4.4mm.
The equivalent weights are 6,378.7 grams -- 225 ounces, that's how big this carat weight is.
You've given the carat weight of a diamond. 'Big', then, is based on the cut of the stone.
14500
A 1.00 point diamond is one carat, so a .12 point diamond is a little over 1/10th of a carat.
The total weight of all the diamonds combined in the carat total weight equals one half carat -- .50. The mm measurement of each individual diamond does not depend on the total carat weight of the collection.
It is essential to know if pearl is natural, If your pearl is 100% natural than the expected price per carat should be somewhere around $100 per carat.
Carat is an indicator of weight; karat is an indicator of purity. Diamonds are measured in carats; gold is measured in karats. So, how big is a karat of gold? It can be as small as a molecule. There is no limit to how large a karat (purity) of gold can be.
A one carat diamond in the round brilliant shape measures aproximately 6.5mm at the girdle. If the diamond is another cut, measurements will be different.
A 10 carat diamond weighs 10 carats. Apparently, you want to know how a 10 carat diamond might look on the 'big-ness' scale. If the stone is a brilliant cut, it will be around 10MM at the girdle. Explore the link below to see the visual sizes of other cuts and carat weights.