Size chart
Round melee is sold by millimetre; here is how mm maps to approximate carat weight and sieve size.
Round melee
0.8 mm ≈ 0.0025 ct · 1.0 mm ≈ 0.005 ct · 1.3 mm ≈ 0.01 ct · 1.5 mm ≈ 0.015 ct · 1.8 mm ≈ 0.025 ct · 2.0 mm ≈ 0.03 ct · 2.5 mm ≈ 0.06 ct · 3.0 mm ≈ 0.10 ct.
Tolerances
Parcels are sieved to ±0.05 mm. Specify a plus/minus range on your order if your setting allows more.