Crushed-ice look

Crushed-ice is the trade name for the fine, frosted scintillation pattern characteristic of radiant cuts, modified cushions, and certain elongated brilliant shapes with high chevron-facet counts on the pavilion. Viewed face-up under bright light a crushed-ice stone shows hundreds of tiny, evenly-distributed flashes rather than the broader flashes of a round brilliant or step cut.

The pattern is geometric, not optical. Chevron facets — V-shaped pavilion facets pointing toward the keel of the stone — break the pavilion into smaller reflecting areas than the eight pavilion mains of a round brilliant. The smaller areas produce smaller individual flashes; the higher the chevron count, the finer the resulting scintillation. A radiant with two chevrons shows broader flashes intermediate between crushed ice and broad flash; three chevrons produce classic crushed ice; four chevrons produce the finest possible pattern.

Cushion modified brilliants behave the same way. A cushion with eight pavilion mains and no chevrons (the "cushion brilliant" pattern) shows broad flash similar to a round. A cushion with chevron facets — the "modified cushion brilliant" pattern — shows crushed ice. Cushions sold under the "antique cushion" name should show broad flash; cushions sold under the "modern cushion" or "modified cushion" name typically show crushed ice.

The aesthetic divides the trade. Crushed-ice supporters describe the pattern as "soft," "luminous," "diamond-like," with the visual character of frosted glass under light. Crushed-ice critics describe the same pattern as "fizzy," "no fire," "broken light," with the visual character of small fragments rather than a coherent reflecting surface. Neither read is wrong — they describe the same physical effect from different aesthetic positions.

Crushed-ice rounds do not exist. Rounds use eight pavilion mains by definition; the geometry produces broad flash, not crushed ice. A buyer wanting the crushed-ice aesthetic must choose a fancy shape with chevron facets — radiant, modified cushion, modified oval, or modified pear. Step cuts (emerald, Asscher) produce neither crushed ice nor broad flash — they produce the distinct "hall of mirrors" effect of long parallel facets, which is its own aesthetic category.

For lab-grown buyers, crushed-ice radiants and cushions are the most common shape choices in the lab-grown channel because they hide the visible cut compromises (table size, depth percentage) that GIA's lab-grown grading does not penalise as tightly as the natural grading. The fine scintillation masks proportion issues that a broad-flash round would expose.