Professional Old Mine Cut Diamond Size Chart
Detailed Carat to MM / MM to Carat Old Mine Cut Diamond Size Chart
The Old Mine Cut Diamond which had dominant reign from the 1700s through the mid 1800s, is a cushion shaped antique cut which features 58 facets with a small table, high crown, and deep pavilion.
The large culet and softly rounded corners were designed to capture the flickering light of candles and oil lamps that were prevalent at the time. This gave it a warm, dancing lights with larger flashes of color that are an entirely different experience from the fiery white brilliance of modern cuts. Often called the true precursor to both the Old European and modern cushion cuts, the Old Mine Cut remains popular today for its vintage charm and elegance.
Wondering what a 1 carat Old Mine Cut Diamond measures like in mm? The following conversion chat which was hand measured and researched by trained gemologists will do that and much more.
Old Mine Cut Diamond MM Size Chart / CT Conversion Chart
0.25 - 5.00 cts
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| OLD MINE CUT DIAMOND CARAT WEIGHT | OLD MINE CUT DIAMOND MM LENGTH | OLD MINE CUT DIAMOND MM WIDTH |
|---|---|---|
| 0.25 | 3.99 - 4.24 mm. | 3.18 - 3.43 mm. |
| 0.3 | 4.25 - 4.50 mm. | 3.38 - 3.63 mm. |
| 0.4 | 4.69 - 4.94 mm. | 3.74 - 3.99 mm. |
| 0.5 | 5.07 - 5.32 mm. | 4.03 - 4.28 mm. |
| 0.6 | 5.39 - 5.64 mm. | 4.29 - 4.54 mm. |
| 0.7 | 5.68 - 5.93 mm. | 4.53 - 4.78 mm. |
| 0.8 | 5.95 - 6.20 mm. | 4.74 - 4.99 mm. |
| 0.9 | 6.19 - 6.44 mm. | 4.93 - 5.18 mm. |
| 1 | 6.54 - 6.79 mm. | 5.24 - 5.49 mm. |
| 1.2 | 6.82 - 7.07 mm. | 5.44 - 5.69 mm. |
| 1.3 | 7.01 - 7.26 mm. | 5.59 - 5.84 mm. |
| 1.4 | 7.19 - 7.44 mm. | 5.74 - 5.99 mm. |
| 1.5 | 7.36 - 7.61 mm. | 5.87 - 6.12 mm. |
| 1.6 | 7.52 - 7.77 mm. | 6.00 - 6.25 mm. |
| 1.7 | 7.68 - 7.93 mm. | 6.13 - 6.38 mm. |
| 1.8 | 7.83 - 8.08 mm. | 6.25 - 6.50 mm. |
| 1.9 | 7.98 - 8.23 mm. | 6.37 - 6.62 mm. |
| 2 | 8.11 - 8.36 mm. | 6.48 - 6.73 mm. |
| 2.2 | 8.38 - 8.63 mm. | 6.69 - 6.94 mm. |
| 2.5 | 8.75 - 9.00 mm. | 6.99 - 7.24 mm. |
| 2.7 | 8.98 - 9.23 mm. | 7.17 - 7.42 mm. |
| 3 | 9.31 - 9.56 mm. | 7.43 - 7.68 mm. |
| 3.5 | 9.80 - 10.05 mm. | 7.83 - 8.08 mm. |
| 4 | 10.26 - 10.51 mm. | 8.19 - 8.44 mm. |
| 4.5 | 10.67 - 10.92 mm. | 8.53 - 8.78 mm. |
| 5 | 11.06 - 11.31 mm. | 8.84 - 9.09 mm. |
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How an Old Mine Cut Diamond Looks Like on Hand
One of the best ways to truly appreciate an Old Mine cut diamond is to see how it sits on the finger. Its classic cushion shape with softly rounded corners delivers elegant finger coverage and a substantial yet graceful presence that feels both timeless and romantic.
The higher crown and unique facet structure create a soft, warm fire that really comes alive when worn. Many people love the antique glow and unique character it gives off in real life, making it a standout choice for vintage inspired or heirloom style jewelry.
Below you’ll find a visual guideline of how different sized old mine cut diamond look like on a finger based on their carat weight.
What are the Ideal Proportions of an Old Mine Cut?
The Old Mine cut is an antique cushion style cut that demands specific proportions to achieve its signature warm fire and romantic appearance. Because of its small table, high crown, deep pavilion, and softly rounded corners, ideal measurements are vastly different from both modern brilliant cuts and even step cuts
What is the Ideal Diamond Depth and Table for the Old Miner Cut?
The right balance for an old mine cut has to do with the depth and table percentage which are essential for bringing out the light dispersion that give it its unique visual presence without appearing too dark or overly bright. The following guidelines will aid to ensure the stone shows off its classic beauty and impressive face up size.
| EXCELLENT | VERY GOOD | GOOD | |
|---|---|---|---|
Table - % | 46% – 54% | 44%– 57% | 42%– 60% |
Depth - % | 63% – 70% | 60% – 73% | 58%– 76% |
Girdle | Thin to Slightly Thick | Very Thin to Thick | Very Thin to Very Thick |
Culet | Medium to Large | Small to Very Large | None to Very Large |
What is the Ideal Old Miner Cut Diamond Length to Width Ratio?
The length to width ratio is one of the most defining features of the Old Miner cut diamond. This shape is intentionally cut close to square with softly rounded corners to create balanced finger coverage and a classic cushion presence. The ideal ratio centers around 1.00 to 1.05. While personal taste always plays a role and is the final decider, the ratios below have consistently proven to deliver the most balanced, elegant, and sought after appearance that sets a quality Old Mine cut apart from an average one.
| EXCELLENT | VERY GOOD | GOOD | |
|---|---|---|---|
| Length To Width Ratio | 1.00 – 1.05 | 0.98 – 1.08 | 0.95 – 1.12 |