Reviewed 11 August 2026

Prepared by the Imperial Cushions editorial team. Laboratory terminology is retained where a report is cited; historical context and dealer judgment are identified as interpretation.

The Antique Cushion Diamond Atlas is a live visual index of diamonds documented by Imperial Cushions. It is designed for comparison, not for forcing hand-shaped stones into a single ideal. Use it to study how outline, elongation and facet architecture vary across actual examples.

How to use the atlas

Open several dossiers in separate tabs and compare one characteristic at a time. Start with outline, then move to the central facet pattern, culet, brightness distribution and condition notes. When dimensions are available, calculate length-to-width ratio and compare face-up spread at related carat weights.

Images are useful for orientation, but video and direct inspection remain essential. Exposure, focal length, background and lighting can change how a diamond appears on a screen.

What to compare

  • Outline: square, softly rectangular, elongated, rounded or irregular.
  • Corners and shoulders: broad, narrow, balanced or individually shaped.
  • Central pattern: organized, asymmetric, open or strongly contrasted.
  • Culet: size, position and integration into the face-up pattern.
  • Facet scale: broad flashes versus smaller, quicker reflections.
  • Face-up spread: visible dimensions in relation to weight.
  • Condition: girdle variation, chips, abrasions, naturals and evidence of repolishing.

For the technical framework behind these comparisons, read Old Mine Cushion Proportions and the Antique Diamond Condition Guide.

Availability can change. A listing in the atlas is a documented reference and does not by itself represent a public offer or guarantee current availability. Contact Imperial Cushions for current status and inspection terms.