DIAMOND TERMS GLOSSARY
- Off-center culet – Culet which is not centered in relation of the girdle outline. When the variation is noticeable, it is considered a major negative
- Off-center table – Table which is not centered in relation to the girdle outline. When the variation is noticeable, it is considered a major negative
- Off-color diamond – Diamond with a tint of color, such as yellow or brown, which is apparent to the unaided eye
- Old European cut – Earliest form of brilliant cut with a circular girdle. Characterized by a very small table, a heavy crown and a great overall depth
- Old mine cut – Early form of brilliant cut with a nearly square or cushion-shape girdle outline, a high crown, a small table, a deep pavilion, and a very large culet. Also called an old-miner.
- Open culet – Large culet, usually visible to the unaided eye through the table
- Origin of color report – Report issued by a gem-testing laboratory, stating whether a diamond’s color is natural in origin, or due to an enhancement process such as irradiation