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FACETING

The most usual method of fashioning a gem is to cut the surface into a number of flat faces, known as facets. This gives the stone its final shape and "cut". The imagine skill of craftsman, or lapidary, will be classified who have professional skill or not. Because the value of gemstone and diamond will be calculated by color, clarity and weight. They have to keep the much weight highest they can by the stone still have to show the good brilliance and fire.

How the stone is faceted

There are several stages in the cutting of a gemstone, each of which may be carried out by a different expert. In our example, a rough diamond crystal is fashioned into a brilliant-cut. This is the most popular cut for this stone because it maximizes the gem's naturally strong light dispersion. However because each stone is a different shape, or has imperfections within it, or because retaining the weight is of paramount importance, the cut in its ideal form (the "make") may not be possible. Nevertheless, the essential aim is to make the diamond bright and "sparkling", showing flashes of colour called fire. To this end, the size, number, and angles of the facets are mathematically calculated. The rough crystal is sawn or cleaved to obtain a basic workable piece, then turned on a lathe against another diamond to give it a round shape. The facets are then cut and polished in stages, and the stone is given a final polish before mounting.

Gemstone faceting zoultier

The name of several part of diamond and gemstone

the part of gemstone and diamond

Now the most popular gemstone cutting will be divided by 5 main type.

1) The brilliant cut is the famous cut and can find by highest ratio in gem market when compare with other cut, many precious and semi-precious stone cut by this type. It ensures that maximum light is reflected out through the front giving brightness and fire.

The round brilliant cut refract maximizes light . This cut have as many as 58 facets and may have one or more shapes, such as a heart or a star, cut into the bottom. Oval produces a larger appearance for a smaller carat weight.

brilliant cut

2) The step cut, maybe called trap cut, shows colour gemstones to advantage, having a rectangular or square table facet and girdle, with parallel rectangular facets.

Very popular emerald cut was perfected on the emerald and is intended to intensify a stone’s colour. The deeper the stone’s "belly", the richer the perceived color.

step cut

3) Mixed–Cut stones are usually rounded in outline, with the crowns (above the gridle) cut as brilliants, and the pavilions step-cut. Sapphires and Rubies, and most transparent colour gemstones are cut in this style. Actually this cut is the first cut that used for sapphire and ruby and these stone kind still have most acceptable for this cut in market.

mixed cut

4) Fancy cut - These have several possible outlines, such as a triangular, kite-shaped, lozenge-shaped, pentagonal or hexagonal. The cut maybe used for rare gems, or to make the most of a flawless or irregularly shape gem. For some fancy cut, have to be cut by lapidary that have high imaginary skill because this cut don't have the fixed theory for cut, for some shape.

fancy cut

5) Polishing - Dark-coloured stones gemstones and those that are translucent or opaque, for instance opal and jade, are often polished rather than faceted, as are organic gems. Gemstones may be polished as beads or as flat pieces to be used in inlay work, or cut en cabochon. A cabochon features a smooth, rounded, polished surface with no facets. The bottom of a cabochon-cut stone is usually flat or nearly flat.

polished stone