Keeping the green clean: Treating this precious stone is common in the industry. Five experts offer some clarity on the process.
Rubies, sapphires and emeralds form the most valuable trifecta in the colored-gem universe. But unlike the first two, which measure 9 on the Mohs hardness scale, emeralds rank at 7.5 to 8 and therefore require more care in handling. Due to various formation and extraction factors, it is natural for an emerald to contain fissures and fractures, which is why eye-visible inclusions are more acceptable in an emerald.
Global wealth expansion and the increased awareness and appreciation for emeralds have increased demand for top-notch stones in the face of limited supply. At the same time, connoisseurs of top-grade emeralds are developing less tolerance for inclusions, seeking an unnatural perfection from a natural gem. The result is that miners, lapidaries and merchants have increasingly been using clarity enhancement to meet the burgeoning demand.