 Carat weight |
 |
 The measuring unit is the metric carat, which
corresponds to the fifth of 1 gram, that is to say 2 decigrams. |
| Thus 1
carat = 0.2 gram. |
| The balance must be well installed under shelter: |
| |
 draughts (to be avoided). |
| |
heat sources. |
| |
vibrations (anti-vibratory table). |
| The stone must be clean. |
| Be careful
with the precision of the balance. |
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Set or reset to zero. |
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Weighting in vacuum (to be more accurate). |
| |
Weighting. |
| Results: |
| |
In many major diamond-trading
countries and international industry organizations, a diamond's weight can only be
rounded up to the next higher hundredth from nine thousandths of a carat. Following
this convention, a stone which weighs 1.568 carats
would be rounded to 1.56 carats; but one which weighs
1.569 carats would be rounded to
1.57 carats. |
| Calculating brilliant cut diamond: diameter/weight. |
| This unit of weight
does not have anything to do with the karats of gold alloys. |
| The carat is divided
into 100 points (hundredths of metric carat), in other words, a diamond of 0.25 carat
has 25 points. The same thing applies to the other precious stones, example: a sapphire of
1.15 carat weighs 1 carat and 15 points. |
| One uses various
kinds of balances to obtain the weight of these precious stones. We invite you
to click on the link to hereafter discover the principal balances which one can find
in the trade: balances. |
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