Laboratory-grown diamonds
A stone for the specification.
Single stones, parcels and layouts. We start with the requirements of your work, then agree the stones and documentation to match.
The material and the finish
From rough to brilliance.
Single stones
Individually reported centre stones, selected against your brief.
Loose parcels
Single-specification or mixed parcels, supplied against an agreed requirement.
Matched layouts
Stones selected together for a consistent appearance within a piece.
Melee & calibrated
Small stones specified by size for repeatable jewellery setting.
Repeat programmes
A specification and supply schedule agreed with your business.
Brilliant cut
Round brilliant
Balanced. Luminous. Versatile.
A circular outline and a radial facet arrangement create an even play of light. The round brilliant is a familiar starting point for solitaire settings and matched layouts.
View round brilliant size chart A closer look at round brilliantIllustrative faceted models, shown under consistent lighting. Actual stones, facet patterns and proportions vary.
A sense of scale
Round brilliant
size chart.
All sizes, in two parts. Select any weight below to compare its approximate millimetre size.
Measured across the circular outline, viewed from above.
Understand carat and the 4Cs01 Small stones
0.02–0.20 ct
| Carat weight (ct) | Diameter (mm, approx.) |
|---|---|
| 1.7 | |
| 2 | |
| 2.2 | |
| 2.4 | |
| 2.5 | |
| 2.7 | |
| 2.75 | |
| 2.8 | |
| 3 | |
| 3.2 | |
| 3.4 | |
| 3.7 | |
| 3.8 |
02 Larger stones
0.25–5.00 ct
| Carat weight (ct) | Diameter (mm, approx.) |
|---|---|
| 4.1 | |
| 5.2 | |
| 5.8 | |
| 6.5 | |
| 7.4 | |
| 8.2 | |
| 9.4 | |
| 10.4 | |
| 11.2 |
† Calculated estimate from nearby published sizes. Below the smallest reference, dimensions are scaled assuming unchanged proportions. These entries describe an illustrative size, not a measured stone.
Educational estimates. Carat measures weight: 1 ct = 0.2 g. Depth, girdle and proportions affect dimensions, so there is no exact mm-to-carat conversion. Check the individual stone’s measurements and grading report.
References: Diamond Source of Virginia size chart · Palloys small-diamond chart (PDF, p. 140)GIA carat education
Build a useful brief
More than
a carat weight.
Shape, millimetre dimensions, colour, clarity and matching requirements help define what you need. For individually reported stones, specify your preferred laboratory and documentation.
Availability and commercial terms are confirmed directly. Our enquiry form prepares a message to send by WhatsApp or email; it does not display live inventory or reserve stock.
Prepare a specificationRequest availability
Begin with
a simple brief.
Add the specifications you know, or describe the requirement in your own words. Availability and documentation are confirmed directly by our team.
Start a conversation