- Emerald Cut
- A form of “step cutting.” It usually is rectangular but sometimes is square, in which case it is known as a square emerald cut. It has rows (steps) of elongated facets on the crown and pavilion, parallel to the girdle, with sets on each of four sides and at the corners. The number of rows, or steps, may vary, although the usual number is three on the crown and three on the pavilion. The emerald cut is seldom used for diamonds in the intermediate color grades, since it tends to emphasize color. It is excellent, however, for colorless stones and when it is desirable to emphasize the color of fancy colors.
- Eye Clean
- A term used to imply that no internal flaws are visible to the unaided eye of a qualified diamond-clarity grader. It is prohibited by the American Gem Society for use by its members. It is also prohibited by the Federal Trade Commission, unless the stone meets the Commission’s definition of the term perfect.