Diamond cut: why a stone sparkles
Cut quality describes how proportions and finish affect light performance. Shape, such as oval or round, is a separate characteristic.
What changes visually?
Look for brightness, coloured flashes and an appealing changing contrast pattern. Jewellery spotlights can make almost any stone sparkle. Compare neutral-light videos under the same conditions. GIA overall cut grades apply to standard round brilliants in the D–Z colour range; do not transfer that scale directly to fancy shapes.
What does that mean for price?
A low price can be poor value if the proportions produce an appearance you dislike. Compare similar shape, weight and origin, then examine light performance. Excellent is a useful starting point, not a complete guarantee of beauty.
Try it in the interactive guide →Check the actual stone
Request a grading report and current video of the specific diamond. Confirm the total price, availability, dispatch location and return terms with the seller. Our diagrams explain concepts; they do not certify stones or calculate fair market prices.
Grading reference: Gemological Institute of America (GIA). Practical comparison advice is Magaura’s editorial interpretation.
Compare loose diamonds →