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Meaning of old mine cut

old' mine' cut"

Pronunciation: [key]
— Jewelry. Jewelry.
  1. a brilliant cut, common in the 19th century, retaining a relatively high proportion of the original stone and having a large culet and small table compared to modern brilliants.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.