What Is an Old Mine Cut Diamond?
An old mine cut is an antique, cushion-shaped diamond: a squarish outline with softly rounded corners, a tall crown, a small flat table on top, and an open culet, the tiny flat facet at the very bottom that reads as a small circle when you look straight down into the stone. Cut by hand between the early 1700s and the early 1900s, it was shaped to glow by candlelight, so it throws broad, warm flashes of light rather than the tight, bright sparkle of a modern cut.
That is the whole definition. Here is what each of those features does, why every old mine cut is one of a kind, how it differs from its round cousin the old European cut, and what to check before buying one.
The anatomy of an old mine cut
Four features define the old mine cut, and together they explain why it looks the way it does.
A cushion outline
The face-up shape is a soft square: four gently curved sides and rounded corners, close to what we now call a cushion. It is the direct ancestor of the modern antique cushion cut.
A high crown and small table
The top of the stone rises tall, and the flat table at its center is small. That combination bends light into broad, colorful flashes, the fire that antique cuts are loved for, instead of the many small bright sparkles a modern cut produces.
An open culet
Instead of coming to a sharp point at the bottom, an old mine cut is finished with a small flat facet, the open culet. Look straight down through the stone and you see it as a tiny circle at the center. Modern cuts close this to a point, so an open culet is one of the clearest signs you are looking at a genuine antique cut, or a faithful reproduction of one.
Hand-cut character
Every old mine cut was shaped by eye, before the machinery that makes modern cuts identical. No two are quite alike, and slight asymmetry is part of the character, not a flaw. That individuality is much of the appeal.
Where it comes from
The old mine cut was the standard diamond cut of the Georgian and Victorian eras, roughly the 1700s through the late 1800s. Cutters worked by hand and by eye, following the rough crystal to save weight, and they proportioned the stone for the light of the day: candles and, later, gas lamps. Under that soft, flickering light, the tall crown and small table gave the broad, warm flashes a room full of candles could set alight.
As electric light and cutting machinery arrived around 1900, the old mine cut evolved into the round old European cut and then the modern brilliant, both engineered for the brighter, steadier light we live with now. That is also why the old mine cut is back today: the antique-ring revival made its warm, characterful look desirable again, and modern cutting can reproduce the style, including on Lab Grown Diamonds, with the same open culet and high crown. It sits naturally alongside the other revived antique styles, like the rose cut.
Old mine vs old European vs modern cushion
Three cuts are close relatives. The difference is the outline and the era.
| Cut | Outline | Character |
| Old mine cut | Soft square (cushion), rounded corners | Antique, high crown, open culet, warm broad flashes |
| Old European cut | Round | Antique, high crown, open culet, the round sibling of the old mine |
| Modern cushion | Soft square, rounded corners | Machine-precise, closed culet, bright even sparkle |
In short: the old mine and the modern cushion share a shape but a century of technology apart, while the old mine and the old European cut share the same antique character but differ in outline, cushion versus round. If you are sorting out how the shapes relate more broadly, our diamond shapes guide lays every outline side by side.
What to check before you buy
Judge it by eye, not by grade. Old mine cuts carry no modern overall cut grade, and they are not meant to. Look at the actual stone face-up: you want lively, warm flashes and a shape you find charming, not modern needle-sharp sparkle.
Expect, and enjoy, some asymmetry. Hand-cutting means slight irregularity. That is authenticity, not damage. Obvious chips or abrasions on an antique stone are a different matter, so inspect the edges.
Know it faces up smaller per carat. The tall crown holds weight in depth, so an old mine cut can look a little smaller face-up than a modern cut of the same carat. You are paying for character, not spread. If maximum size is the goal, our guide to which diamond shape looks biggest points elsewhere.
Read the grading report and confirm it. A Lab Grown old mine cut carries the "LG" girdle inscription and is graded by the same labs as any stone, so read the grading report and confirm the number on the lab's own site.
And the framing that matters most: choose an old mine cut because you love the warmth and the history in it. A diamond is a love piece, something to keep and to mean something, not an investment. If the candlelit, one-of-a-kind look is what moves you, few cuts have more soul.
About the Author
Jeffrey Bais
Jeffrey Bais oversees jewelry production with precision and dedication. He ensures every piece meets the highest standards of quality and craftsmanship.
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FAQ's
An old mine cut is an antique, cushion-shaped diamond with a tall crown, a small table, and an open culet (a small flat facet at the bottom that reads as a tiny circle from above). Hand-cut from the 1700s to the early 1900s and proportioned for candlelight, it gives broad, warm flashes rather than modern bright sparkle.
The outline. An old mine cut has a cushion (soft square) shape, while an old European cut is round. Both are antique, both have a high crown and an open culet, and the old European cut is essentially the round evolution of the old mine cut that led to the modern round brilliant.
The culet is the facet at the very bottom of a diamond. Modern cuts close it to a sharp point, but antique cuts like the old mine were finished with a small flat facet, the open culet, which appears as a tiny circle when you look straight down into the stone. It is one of the clearest signs of a genuine antique cut.
They give broad, warm flashes rather than the tight, bright sparkle of a modern cut. The high crown and small table were designed to return light in big colorful flashes under candlelight. If you want maximum modern sparkle, a modern brilliant is the better choice; the old mine cut is chosen for its warm, antique character.
Yes. The old mine is a cutting style, so it can be cut on Lab Grown Diamonds, reproducing the high crown and open culet with modern consistency. A Lab Grown old mine cut is a real diamond, graded by the same labs and carrying the "LG" girdle inscription, and it costs well under a comparable mined antique stone.
Yes, if you want a warm, antique, one-of-a-kind look. Diamond is a 10 on the Mohs scale regardless of cut, so it wears well daily. Expect it to face up a touch smaller than a modern cut of the same weight and to show gentle hand-cut asymmetry, both of which are part of its character.