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Weight Rounding Rules
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| Weight of the gemstone is rounded down to 2 decimal numbers unless the rounded digit is 9, then it is rounded up as per the below examples: |
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| Original Weight |
Rounded Weight |
| 0.997 ct |
0.99 ct |
| 0.998 ct |
0.99 ct |
| 0.999 ct |
1.00 ct |
| 1.108 ct |
1.10 ct |
| 1.109 ct |
1.11 ct |
| 1.110 ct |
1.11 ct |
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| Where the weight of a carat is defined as: |
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| 1 Carat (ct) |
= 0.2 g |
| 5 carat |
= 1 g |
| 100 ct |
= 20 g |
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| Examples for weight and size: |
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The largest sapphires in the world is over 100 ct (= 20 g) and for example may have dimensions of:
length 3cm (30mm), width 2.5 cm (25mm), depth 2cm (20mm). |
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| Diamonds of same weight as sapphires are considerably larger in diameters as the specific weight of diamonds (3.52) is well below that of sapphires (4.00). |
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