From ArticleWorld

Green beryl which is known as emerald also possesses variety of other colors like blue, pink, yellow and even red. But the beryl that bears a composition of trace amount of chromium and sometimes irons brings out the green color in the green color of the stone. An emerald of right shade of green can be more valuable than a diamond. This stone is highly acclaimed by its weight but often goes down because of the bubbles formed in it, also called inclusions. I is said that a beryl has a hardness of 7.5 on Moh-scale having 10points. But these weights vary with the inclusions formed in the stones.

Most of the emerald undergoes an oiling process as their post lapidary and the oil enters through the minute pores on their bodies. Most of these stones bear numerous inclusions and a stone without them are rare to be found.

Synthetic emerald

Emerald is a very rare stone and highly in demand all round the world. Thus an urge to produce synthetic emeralds is basically, to meet the demands of the consumers. Both the processes of Flux growth and Hydrothermal have been experimented and a successful method is acquired out of it to produce artificial emeralds on raw and colorless beryl. During the synthesis of emerald, Flux grown synthetic emerald fluorensce along with long wave UV light due to indicator are added, however these 'created' emeralds contain all the same chemical and gemological compositions as we found in the natural specimens. As the FTC strictly says, … essentially same optical, physical and chemical properties as the stone names, it has maintained the quality of these synthetic stones. In fact, Flux grown synthetic stones have no water inclusions like the natural ones that originate in the hydrothermal places, except the red ones of Utah which are anhydrous, so this makes the former more resistant to high temperatures than the later ones. The Flux grown synthetic emeralds contain inclusions known as wispy. Tairus is the world's largest maker of synthetic emeralds. On the other hand, Gachala Emerald found at La Vega de San Juan mine in Gachala Columbia holds the prestige of having found one of the largest emeralds of 858 carats, in 1967.

Mythical usage of emerald

Emerald is the sacred stone of goddess Venus and a token of preserving love. It is regarded as a traditional birthstone for May. It is highly used as a tranquilizer for troubled mind, epilepsy, dysentery and weak eye-sight. As Rebbeau Bachva stated that 'Nofech' is an emerald on the famous ephod represents the tribe Judah, in the verses of Exodus. However, it is contradicted that 'Nofech' is only a 'garnet' stone.

A little insight in the history reveals that emerald was also popular in the Roman Empire. The emperor Nero was so passionate about emerald that he made glasses out of them to watch gladiator matches. Emerald is also regarded as a traditional gift for 20th,30th and 55th wedding anniversaries in many cultures.