Understanding Diamond Cut
Cut is the most important of the 4 C's. While colour, clarity, and carat weight are determined by nature (or the growth process), cut is the human contribution - the skill of the diamond cutter in transforming rough into a finished gem that captures and returns light beautifully.
What Cut Grades Measure
A diamond's cut grade evaluates three aspects of its interaction with light:
- Brilliance: The total amount of white light reflected back to the eye from internal and external surfaces
- Fire: The dispersion of white light into coloured spectral flashes
- Scintillation: The pattern of light and dark areas, and the sparkle produced when the diamond, light, or observer moves
Cut Grade Scale
- Excellent/Ideal: Maximum light return. The diamond exhibits outstanding brilliance, fire, and scintillation. Recommended
- Very Good: Nearly all light is returned. Slight deviations from ideal proportions that are invisible to most viewers. Excellent value
- Good: Most light is returned. Noticeable deviations from ideal but still an attractive diamond
- Fair/Poor: Significant light leakage. The diamond appears dull or dark relative to its potential
Why Cut Matters Most
A well-cut diamond with lower colour or clarity grades will often appear more beautiful than a poorly cut diamond with higher grades. This is because cut directly controls sparkle - the quality that draws the eye and creates emotional impact. A poorly cut diamond allows light to leak out the bottom and sides, regardless of how colourless or flawless it may be.
Our Recommendation
Always prioritise cut. Choose Excellent or Very Good cut grades, then allocate remaining budget to carat weight. A smaller, well-cut diamond will always outperform a larger, poorly cut one in visual beauty and presence.