Round Brilliant Cut Explained: Why It Remains the Trade Benchmark

What “brilliant” actually means

A modern round brilliant typically uses 57 or 58 facets (the 58th is a culet). Crown and pavilion angles are tuned so light entering the table reflects back to the eye instead of leaking through the bottom.

For trade buyers, the practical question is consistency: table percentage, depth, and symmetry across a parcel. A single stone can look spectacular while the lot fails a channel or halo programme.

Why Hong Kong still prices rounds tightly

Hong Kong remains a matching and export hub. Spec sheets for bridal and centre-stone programmes often lead with round millimetre sizes. Certification and colour/clarity grading are easier to compare when the cut is standardised.

If you need calibrated rounds for China or Bangkok manufacturing, ask for millimetre size, colour, clarity and quantity — not a vague “nice white rounds” request.

Trade tip

When comparing two parcels, look at size spread and fluorescence as carefully as colour. A 0.05 mm drift across a dozen stones costs more on the bench than a one-grade colour difference sometimes does.