Diamond shapes
Shape is taste. Each one also changes what to look for.
From the CTJ Jewellery team, led by founder Greg Ward
Shape is the outline of a diamond seen from above. Cut is how well it is faceted. Every shape is available in natural and lab-grown, and each one changes how the diamond sparkles, how large it looks for its weight and which grades matter most.
The ten shapes
Round
The round brilliant cut (RBC), faceted for maximum light return. The most requested shape.
Hides colour and inclusions better than any other shape.
Oval
Elongated brilliance that looks larger than its weight.
Check for a bow-tie shadow across the centre.
Emerald
Long, open step-cut facets with a quiet, architectural look.
Shows clarity, so choose carefully.
Cushion
A softened square with large, glowing facets.
Cuts vary widely. See it before you choose.
Pear
Round at one end, tapering to a point.
Symmetry matters, and the point needs a protective claw.
Princess
A square brilliant with crisp, sharp corners.
Set with protected corners to prevent chipping.
Radiant
Trimmed corners with brilliant faceting throughout.
Very good at hiding inclusions.
Marquise
Long and pointed at both ends, giving the most finger coverage.
Prone to a bow-tie shadow, so view it in person.
Asscher
A square step cut with deep, cropped corners.
Like the emerald, it shows clarity.
Heart
One of the hardest shapes to cut well.
Best from about 0.75ct, where the outline reads clearly.
