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Colored and Colorless Diamonds. The color of a diamond also plays a role in its value, with colorless diamonds given the greatest value. There are pink, yellow, blue and even black diamonds.
Type Ib make up about 0.1% of all natural diamonds. They contain up to 0.05% (500 ppm) of nitrogen, but the impurities are more diffuse: the atoms are dispersed throughout the crystal in isolated sites. Type Ib diamonds absorb green light in addition to blue, and have a more intense or darker yellow or brown colour than Type Ia diamonds.
Since the 1950s, techniques can produce gem-quality diamonds of essentially any desired chemistry in sizes up to about 1cm. [6] Although some manufacturers do label their synthetic diamonds with serial numbers, there is no guarantee that a given diamond is not man made, although sometimes an unnatural chemical composition or pattern of flaws may suggest a diamond is synthetic.
It is impossible to tell the difference between newly mined and polished diamonds and recycled diamonds. As a result, the price should be similar. A recycled diamond might be in excellent condition, though quite possibly have a dated cut or look. As such, a lot of recycled diamonds go through a re-cutting or re-polishing process to make them ...
The 253-carat Oppenheimer Diamond—an uncut diamond does not show its prized optical properties. In colored diamonds, cutting can influence the color grade of the diamond, thereby raising its value. Certain cut shapes are used to intensify the color of the diamond. The radiant cut is an example of this type of cut.
One will always find graining in rough diamonds known as "Macle's". Macles are easily identified by its triangular shape. The graining line on the Macle is a natural cleaving plane where the diamond can easily be split in half. Diamonds with graining will never be graded as Flawless as its maximum grade would only fetch Internally Flawless (IF).
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This is done by requiring diamond-producing countries to provide proof that the money they make from selling the diamonds is not used to fund criminal or revolutionary activities. Although the Kimberley Process has been moderately successful in limiting the number of conflict diamonds entering the market, some still find their way in.