Lab-Grown Diamond Melee Size Chart — mm to Carat, Stones per Bag & Prices (DE VS-VVS)

How the counts are estimated

Carat

A carat is a unit of mass: 1 ct = 0.2 g. A 1-carat bag holds 0.2 g of stones whatever their size.

Weight per stone

For a round brilliant, weight rises roughly with the cube of the diameter. We use the trade's standard diamond sieve relation — about 0.005 ct at 1.0 mm, 0.015 ct at 1.5 mm, 0.03 ct at 2.0 mm and 0.10 ct at 3.0 mm — and apply it to the stated size of each bag. A 1.5 mm bag comes out at about 65 stones; a parcel that runs to the small end of the ±0.1 mm tolerance holds more, one that runs large holds fewer.

Depth and girdle

Deeper stones and thicker girdles weigh more at the same diameter, so a real bag can land outside the estimate. Treat the count as a planning number and the millimetre size as the specification.

Bag weight from 3 mm up

A 3 mm stone weighs about 0.10 ct and a 3.6 mm stone about 0.17 ct, so a bag of six to ten stones cannot always be made up to exactly 1.00 ct. We pack each bag as close to 1 carat as whole stones allow, so the total can run slightly over or under. Below 3 mm the stones are small enough to make the bag up to 1 carat.

Melee

The trade's word for small accent stones in this size class — a word for the use, not a fixed carat boundary.

Ordering

• Every parcel is hand-inspected and photographed or filmed before dispatch.
• Shipping $20 flat worldwide, free over $100; duties on us in the US and Europe, paid by the recipient elsewhere. Usually ships within 3 business days.
• Not as described or damaged in transit? Replaced or refunded within 14 days.
• Minimum order: one 1-carat bag, or one single stone. No grading report is included with melee or stones under 1 ct.
• Need a size that is not listed, or a matched pair? Message Leilei — she replies within one business day.