Feature Gems & Gemology, Spring 1988, Vol. 24, No. 1

Faceting Large Gemstones

The quest for the largest permeates all societies and disciplines. With the advent of new machinery and techniques, size records for faceted gemstones are falling constantly.  Currently, a 22,898-ct yellow topaz holds the record for weight and a 19,548-ct citrine holds the record for size. This article discusses some of the more important gemstone giants, and describes the specialized equipment and techniques developed to cut and polish them.