Old Miner Diamond — Synonym for Old Mine Cut Diamond
Old Miner Diamond — Synonym for Old Mine Cut Diamond
A diamond fashioned in the cushion-outlined hand-cut brilliant style of the Georgian and Victorian periods
An old miner diamond is a diamond fashioned in the old miner cut — a phonetic variant of old mine cut — and is therefore interchangeable in trade usage with old mine cut diamond. The two terms describe the same range of physical stones: cushion-outlined, hand-cut brilliants with high crowns, small tables, open culets, and 58 facets cut by hand on bow-driven scaifes during the eighteenth and nineteenth centuries. The variant old miner appears slightly more often in spoken trade than in written reference, but is in active use in both registers.
Defining characteristics
The defining features of an old miner diamond are the cushion outline (square or rectangular with rounded corners), the steep crown angle, the small table relative to the girdle dimensions, and the large open culet visible as a flat octagonal disk through the table when the stone is viewed face-up. The 58-facet pattern is the standard brilliant pattern, but executed by hand with the variation in placement and proportion characteristic of pre-mechanised cutting. Two old miner diamonds of similar weight will often look noticeably different in their proportions and visual character.
Origin
Most old miner diamonds were fashioned from rough originating in India (the Golconda mines) and Brazil (Minas Gerais), with later production from South African rough as the cut was being superseded. Provenance of the rough is rarely determinable from the cut diamond alone, but laboratory examination can sometimes infer Indian Golconda origin from low-nitrogen Type IIa material. The cutting itself was performed in Antwerp, Amsterdam, London, Lisbon, and other European centres, with a smaller volume of cutting in India.
Optical character
Old miner diamonds produce broad, slow flashes of light and chunky scintillation that contrasts sharply with the fine, rapid scintillation of modern brilliants. Under candlelight or warm tungsten illumination, they exhibit a luminous, romantic character that connoisseurs of antique cuts particularly value. The cushion outline gives the stone a softer, less geometric presence than the round outline of an old European cut or modern brilliant.
In the trade
Loose old miner diamonds trade at the same discount to modern brilliants as other antique cuts — typically 10 to 30 per cent depending on cut quality within the historic style. In original Georgian or Victorian settings, they carry the antique-jewellery premium and are valued as historic objects. Care considerations follow those of the old mine cut: gentle handling around the open culet, conservative cleaning of original settings, periodic professional inspection. For full reference, see old mine cut diamond.