Some diamonds catch your eye with their sparkle. Others draw you in with their character. Old mine cut diamonds offer both, with softly rounded outlines, broad flashes of light, and an individuality that makes each stone a little different from the next.
Popular during the Georgian and Victorian eras, these antique cuts have a look all their own. Their proportions and faceting differ from modern diamond cuts, making them an interesting choice for anyone drawn to vintage jewellery or looking to bring a little history into a contemporary design.
What Is an Old Mine Cut Diamond?
An old mine cut is a historical diamond cutting style that was common from the early 1700s through the late 1800s. It typically has a squarish or slightly rectangular outline with rounded corners, making it an early predecessor of today's modern cushion cut.
Some of its defining features include:
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A small table: The flat facet on top of the diamond.
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A high crown: The upper portion of the diamond above its widest edge.
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A deep pavilion: The lower portion beneath the widest edge.
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A large culet: A flat facet at the bottom of the diamond, often visible when looking through the top.
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Broad facets: These create the larger flashes of light associated with antique cuts.
Together, these features give old mine cuts their distinctive appearance: a softly rounded outline and a noticeable play of light and shadow.
A Diamond Shaped by Its Origins
Early diamond cutters worked with the tools and techniques available to them, often shaping stones to retain as much weight from the original rough crystal as possible. Unlike modern diamond cutting, which follows more standardized proportions, antique cutting methods allowed for considerable variation.
One old mine cut might be almost square, while another is more elongated. Facet patterns, symmetry and proportions can vary from stone to stone, giving each diamond its own look.
For anyone drawn to jewellery with a bit of personality, that individuality is part of the appeal. Rather than looking for two stones that are exactly alike, you can appreciate what makes a particular diamond stand out.
Why Is It Called an “Old Mine” Cut?
Despite the name, “old mine” describes a cutting style rather than confirming that a particular diamond came from a specific mine.
Historically, the term was associated with squarish brilliant-cut diamonds from earlier diamond-producing regions, including India and Brazil. As diamond mining expanded in South Africa during the late 19th century, those earlier sources became known as the “old mines.” Over time, the name became associated with the distinctive cutting style.
The terminology offers a glimpse into diamond history, but a stone's actual origin requires separate documentation.
What Makes the Sparkle Different?
Old mine cuts are known for their broad flashes of light. Their larger facets create a different visual effect from the smaller, more uniform reflections often associated with modern brilliant cuts.
Neither style is necessarily better than the other; it comes down to the look you prefer. Some people love the crisp, regular sparkle of a modern brilliant, while others are drawn to the larger flashes and shifting contrast of an antique cut.
The culet is another distinctive feature. When viewed from above, it can appear as a small shape in the centre of the diamond. It's simply a facet at the bottom of the stone, not a hole or a flaw.
Old Mine Cut vs. Old European Cut
Old mine cuts and old European cuts share several features, including high crowns, relatively small tables and visible culets. The easiest way to tell them apart is by their outline.
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Old mine cut: Usually square or rectangular with rounded corners, giving it a cushion-like shape.
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Old European cut: Round in outline, with a more symmetrical arrangement of facets.
Both belong to the history of antique diamond cutting, but they developed along different paths. The old mine cut is an early predecessor of the modern cushion cut, while the old European cut helped pave the way for today's round brilliant.
If you're drawn to a softer, cushion-like shape, an old mine cut might be worth exploring.
Choosing an Old Mine Cut Diamond
Because old mine cuts vary so much, there's more to consider than carat weight alone. Their deeper proportions mean that two diamonds with the same carat weight can look quite different in size when viewed from above.
When choosing a stone, consider:
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Shape: Do you prefer a squarish outline or something more elongated?
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Culet: Would you like a prominent culet, or one that's less noticeable?
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Faceting: How does the pattern look as the diamond moves and catches the light?
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Measurements: How large does the diamond appear face-up, rather than what does it weigh?
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Condition and setting: Is the stone suitable for the setting you have in mind?
Condition is particularly important with antique diamonds. GIA notes that old mine cuts can have very thin girdles in places. The girdle is the narrow edge around the diamond, and its condition should be assessed before choosing a setting. An experienced jeweller can help determine how best to protect the stone while showing off its character.
It's also worth asking whether a diamond is a genuine antique cut or a modern diamond cut in an old mine-inspired style. Both can be beautiful options, but knowing the difference helps you understand what you're choosing.
An Antique Cut, Your Own Style
One of the things we love about old mine cut diamonds is how well they work with different design styles. A simple polished bezel can emphasize the stone's rounded outline, while a delicate claw setting keeps the focus on its facets. Floral engraving and milgrain details can lean into a vintage-inspired look, while a clean, modern band creates an interesting contrast.
There's no rule that an antique diamond needs to sit in an antique-looking ring. Sometimes, pairing an old cut with a contemporary setting is what makes the design work.
At Magpie, we love jewellery that feels personal rather than prescribed. If an old mine cut has caught your eye, we'd be happy to explore the shapes, settings and details you love and help bring them together in a ring that feels like yours.
