Feature Gems & Gemology, Summer 1986, Vol. 22, No. 2

An Examination of Four Important Gems

The authors report on their gemological examinations of four important gemstones: the Star of Bombay sapphire, the Portuguese diamond, and two large diamonds known as the Marie Antoinette earrings, all of which are part of the collection at the Smithsonian Institution. Brief historical information on some of the pieces is also included.