- Off-center Culet
- A culet that, due to differences in the angles of the opposite pavilion facets, is off center with respect to the girdle outline. It usually results from repairing or repolishing a portion of the pavilion or from attempting to retain maximum weight from a distorted piece of rough.
- Old-european Cut
- A term applied to the earliest form of circular-girdled full brilliant. It is characterized by a very small table, a heavy crown, and usually great overall depth. Improperly referred to as an old-mine cut.
- Old-mine Cut
- (a) An early form of brilliant cut with a nearly square girdle outline. (b) Incorrectly applied to a somewhat more modern style of brilliant cut that also has a much higher crown and smaller table than the modern brilliant cut, but whose girdle outline is circular or approximately circular—a style of cutting that is more properly called a “lumpy stone” or and old-European cut.
- Open Table
- A term that is sometimes used to refer to the table on a spread, or swindled, diamond. To some, any table diameter of 60% or more of the girdle diameter is open; to others, open means 65% or more.
- Oval Cut
- A brilliant style of cutting in which the girdle outline is elliptical; i.e., a rounded oblong. Also called the “oval brilliant cut.”