Characterization and Grading of Natural-Color Pink Diamonds

nown for their great beauty and rarity, pink diamonds have long been sought after by jewelers, collectors, and consumers (figure Notable pink diamonds such as the Darya-i-Nur (reported to weigh more than 175 ct), the Agra (known historically to weigh 32.24 ct and recently recut to 28.15 ct), and the 20.53 ct Hortensia (figure Table As with blue diamonds, however, the infrequency with which pink diamonds were encountered in the trade (prior to the discovery of the Argyle mine in Australia) or were documented by gemological laboratories resulted in a scarcity of published information on them.