Cushion The cushion cut is an antique-style diamond cut that has recently come back into fashion. It is a cross between an Old Mine Cut (a deep cut with a high crown and large facets that was common in the late 19th and the early 20th centuries), and a modern oval cut. The cushion shaped diamond is squarish with rounded corners and sides.
Round cut Round diamonds are the most popular of all the shapes, perhaps because their circular proportions display the most “fire” and reflect more light back to the observer than any other shape. Round diamonds require that more rough be removed during cutting and polishing than with other shapes. The combined popularity of round diamonds and the significant weight loss during cutting are the two main contributing factors to the relatively higher price of these stones.
Sawing Diamond sawing is a twentieth century innovation. Although cleaving may be efficient, it limits the cutter to shaping the stone according to its natural lines of cleavage. Sometimes, diamonds have to be cut against a cleavage plane (against the grain). The diamond saw, a lubricated circular steel blade allows cutters to go against the grain of the diamond without shattering it.
Moreover, the diamond saw allows diamonds to be salvaged from misshaped diamond rough. Sawing is a more expensive process than cleaving, as it requires about one-tenth of a carat of diamond dust (applied to the saw with oil) for every carat of sawed diamond. It is also a much slower process than the single-stroke process of cleaving. It may take days to saw through a two-carat diamond. Extant methods include the use of lasers to saw through diamonds.
Trilliant cut This is a brilliant-cut triangle diamond – a wedge shape with fiery brilliance. It can be a traditional triangular shape with pointed corners, or a more rounded triangular shape. Trilliants (also called Trillions) are often used as diamond accents in three stone rings and other jewelry settings, but may also be chosen to be set as solitaire diamonds. An equilateral triangle is prefered in a trilliant diamond. Variance in the ratio of length to width should not deviate considerably.
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