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Melee size chart: mm to carat weight
A 2.0 mm round melee stone weighs about 0.03 ct, so about 33 stones make one carat; the table converts 1.0 to 4.0 mm.
Round melee: diameter, weight per stone and stones per carat
| Diameter | Weight per stone (about) | Stones per carat (about) |
|---|---|---|
| 1.0 mm | 0.004 ct | 267 |
| 1.3 mm | 0.008 ct | 121 |
| 1.5 mm | 0.013 ct | 79 |
| 1.7 mm | 0.018 ct | 54 |
| 2.0 mm | 0.030 ct | 33 |
| 2.5 mm | 0.059 ct | 17 |
| 3.0 mm | 0.101 ct | 10 |
| 3.5 mm | 0.161 ct | 6 |
| 4.0 mm | 0.240 ct | 4 |
How the chart is worked out
| Item | Rule |
|---|---|
| Formula | Average diameter squared x depth x 0.0061, the published estimation formula for round brilliants |
| Depth | Standard round brilliant proportions |
| Accuracy | An estimate for planning. Actual weights vary with cut and are confirmed in your quotation |
| Sieve numbers | Sieve sizes differ between suppliers, so quote the mm size |
Using the chart
Pick the diameter in mm from your design, read the weight per stone, then multiply by the stone count to get the carat weight of a parcel. For stones in a halo, a pave band or a tennis line, the Side Stone Finder works out the size and count from the centre stone for you.
Melee is not a fixed standard. Order by mm size and quantity, not by a sieve number, and state the tolerance you need in your enquiry.
Questions
- How many 2 mm diamonds make a carat?
- About 33, based on the standard round brilliant estimation formula. Real counts vary with cut.
- What does a 1.5 mm round diamond weigh?
- About 0.013 ct per stone.
- Is melee sold by mm or by sieve size?
- We quote by mm size, because sieve numbering differs between suppliers.
- How are the chart weights calculated?
- With the published round brilliant estimation formula: average diameter squared x depth x 0.0061. The Side Stone Finder page shows the same rules.
- Is there a minimum order for melee?
- No. One stone is a valid order.
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