emeralds are cut in jaipur - india and tel-aviv - israel, as well as in the mining countries. emerald is one of the most difficult gemstones to cut because of the high value of the rough stone and the many inclusions found in crystals.
small changes in orientation can make a large difference in the final appearance of the gem. skilled craftsmen who specialize in cutting emerald can be found in cities around the world for jewelers who insist on having stones perfected for the optimum brilliance and vibrancy.
the rough stone
the relatively weak hardness of the emerald beryl explains that all the rough stones are extracted on the location of their crystallization, contrary to the corindons, the big part of which, not to say the main part, is composed of moved rough stones, found in alluvium, sometimes very far from the primary bed.
the color is not alike in most of the colored stones. it must be put in center. this first operation is very important. the future aspect of the stone depends on it. it entirely relies on the cutters skill.
when preparing the stone, the cutter will have to make a very delicate choice to find the best global output: color, sizes, purity.
a pure emerald is extremely rare. its material contains frequently small inclusions. when they are too numerous, they harm the transparency of the stone and the strength of its color.
the preparation of
its consists in sawing the rough and choosing the final shape of the stone: octagonal, oval, pear, round, marquise shapes...
the saws which are used for this type of work must be very fine and well balanced.
the cutter can modify the color of the stone by acting on the facets. a stone which is too dark gets lighter if he cuts a big table. on the contrary, a stone gets darker, if he cuts a small table and many facets.
even if they equally look like, an emerald cut (octagon) will be more expensive than an oval.
then, the stone will be polished. the selection of abrasives is very important. the polishing is much more delicate than the cut. the outcrop of inclusions on the surface will let the polishing oil (blackened by the abrasion of diamond and tin) go into stone.
once cut and polished, the stone will be immersed in last oil bath.
the precautions taken when cutting and polishing should be known by the workers who will manufacture, set and polish the jewel. notice is hereby given that the emerald should not be immersed in an ultrasounds bath: for further repairs, it must be kept in mind that an emerald should never be heated.