The old mine cut is the predecessor to the modern cushion brilliant, cut by hand before electric tools existed. It features a high crown, small table, large culet, and chunky facets that produce a warm, romantic light pattern entirely different from modern precision cuts.
Old Mine Cut diamonds are known for moderate brilliance with 58 facets. They're popular for vintage-style engagement rings and antique restoration. Here are the trade-offs.
A 1-carat old mine cut diamond measures approximately 6.2 x 6.2 mm. Here are the most common sizes from 0.25 ct to 5 ct.
| Carat Weight | Size (mm) |
|---|---|
| 0.25 ct | 4 x 4 mm |
| 0.33 ct | 4.3 x 4.3 mm |
| 0.5 ct | 5 x 5 mm |
| 0.75 ct | 5.6 x 5.6 mm |
| 1 ct | 6.2 x 6.2 mm |
| 1.25 ct | 6.5 x 6.5 mm |
| 1.5 ct | 7 x 7 mm |
| 2 ct | 7.5 x 7.5 mm |
| 2.5 ct | 8 x 8 mm |
| 3 ct | 8.5 x 8.5 mm |
| 4 ct | 9.5 x 9.5 mm |
| 5 ct | 10.5 x 10.5 mm |
View full old mine cut size chart → with all sizes from melee to 5+ carats.
Old Mine Cut diamonds are priced at highly variable. well-cut examples can match or exceed modern cushion prices. average examples are 20-40% below modern equivalents.. Price depends on carat weight, color, clarity, and cut quality. For a personalized estimate, use our diamond price estimator.
Estimate old mine cut diamond price →Last updated: 2026-07-16