Ruby Market

The vast majority of faceted Mong Hsu rubies found on the world market are heat treated, and there is a wide range of qualities. Large quantities of transparent stones with fine red color were available in 1993 and 1994 in sizes up to 0.7 ct. Stones of good to very good color and clarity were found in the 1-2 ct range. Stones between 3 and 5 ct were found to be mostly of medium to good quality.

Mong Hsu rubies are typically heat treated, to produce a well-saturated red hue as shown here. Like most of the faceted stones produced to date, these Mong Hsu rubies, from the study sample, are small, 0.348 to 0.683 ct.