Using the query 'diameter' assumes that the diamond is a round brilliant cut. A 2.50 carat round brilliant cut measures about 9MM at the girdle -- your diamond's diameter will be slightly shorter.
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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.
0.25 means its the carat of diamond,meaning you have quarter of carat real diamond
Every diamond is valued by its cut, colour, clarity and carat weight. A diamond this large is rare: you may be able to find a comparable carat weight diamond in an auction catalog from Sothebys or Christies.
A carat, in relation to diamonds, is a unite of mass that is equal to 0.2 grams. Meaning a 4 carat diamond weighs just over .8 grams and an 8 carat diamond is 1.6 grams.
A carat is a unit of weight used for gemstones. One third carat is the weight of the diamond.