Old Mine Cut Diamond Buying Guide: Rarity & Price

Old Mine Cut is unlike every other shape in this cluster in one important way: it isn't being made any more. Every stone available today is either an original cut from roughly 1725–1900 or a deliberate modern recreation — for the full gemological background see the Old Mine Cut page in our Cut Library; this guide focuses on what makes buying one different.

Why genuine Old Mine Cuts are rare

Diamond cutters have been recutting old stones into modern brilliants for over a century, chasing the extra sparkle a modern cut delivers — which means every untouched, original Old Mine Cut still in circulation has survived that temptation. New diamonds keep entering the market constantly; old, unmodified Old Mine Cuts do not, which is the core reason genuine examples command a real premium over an equivalent modern stone.

What drives the price

Beyond the standard 4Cs, an authentic Old Mine Cut's rarity itself carries a premium — commonly cited in current trade pricing as somewhere in the region of 10–25% over a comparable modern brilliant of similar size and quality, more for larger stones with clearly documented age and provenance. Cut and symmetry vary far more than in modern diamonds, since these were hand-cut without today's precision equipment — that hand-cut irregularity is part of the appeal for many buyers, not a flaw to be minimised.

What to check before buying

• Genuinely antique vs modern recreation — both are legitimate purchases, but the price and rarity story are completely different; ask directly and get it stated on the certificate or invoice.
• Certification — GIA and IGI both grade Old Mine Cuts; see our cert lab guide. A certificate matters even more here, since visual irregularity that would flag a modern stone as poorly cut is often original character in an antique one.
• Culet and crown height — Old Mine Cuts typically show a visible culet (a small flat facet at the point) and a notably higher crown than modern brilliants; this is expected, not a defect.

Where to actually buy one

Because so few are in circulation, Old Mine Cuts are harder to source than any other shape in this guide — specialist antique dealers and estate jewellers are the traditional route, and availability from any single seller is inconsistent by nature of the stone's rarity. This is exactly the kind of stone where a wider dealer network, rather than a single showroom's stock on a given day, matters most.

Related reading

• Elongated cushion cut diamond buying guide
• Vintage & antique jewellery buying guide
• Buying a loose diamond for a bespoke engagement ring

Sources: rarity and pricing guidance consolidated from current trade-jeweller buying guides (Brilliant Earth, Estate Diamond Jewelry, The Diamond Pro, CaratDiamonds).