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.
An old mine cushion combines a softly squared outline with broad facets and an open culet. Many examples have a high crown and small table. The result is a pattern of large flashes that shifts as the stone turns.
Read the outline, then the light
Start with the corners and sides. Some cushions are round and pillowy; others have straighter sides and clipped corners. Turn the diamond slowly and follow the central facets. Notice where the bright areas appear, how they move and whether the centre stays lively at normal viewing distance.
The 3.01 ct G VS2 dossier gives a useful starting example: an 8.24 × 8.05 mm face, rounded corners and a small open culet. Its almost-square outline makes the relationship between the central facets and the corners easy to study.
Before choosing one
Compare the report, side profile and condition notes with the moving view. Thin girdle areas and the culet need particular attention when planning a setting. Read the condition guide, then browse the documented stones for outlines you enjoy.
See the details in a stone
3.01 Ct. G VS2 Old Mine Cushion Brilliant
A near-square, 3.01 ct old mine cushion with a 51% table.
3.09 Ct. F SI2 Old Mine Cushion Brilliant
A 3.09 ct old mine cushion with a longer outline and 55.2% depth.