Shapes of Diamond Stones

posted Jan 17, 2011, 7:14 PM by FU RONG GEMS   [ updated Mar 22, 2015, 9:26 PM ]
 Shapes of Diamonds:
Diamonds are cut in many different shapes.
Single Cut Diamond:
The first brilliant cut was introduced in the middle of the 17th century, which was known as the Single Cut and they had 8 facets at the top and 8 facets at the bottom with a table, totaling 17 facets.
As skills and technology advances, diamonds are then cut into various shapes which are decided by diamond cutters according to the shape of the rough diamond and the flaws within the diamond. A diamond cutter would also like to maximize its weight without compromising much on its brilliance. Most basic shapes are enhanced with trimmed or rounded corners, sometimes adding additional facets to the stone.
Nowadays specific cuts are made by companies using advanced laser cutting equipment and are licensed under their own brand names.  The Hearts On Fire Diamond and the Asscher Cut are good examples.
The Round Brilliant Cut diamond is by far the most popular, because light entering the diamond can be optimized and reflected totally from within the stone to exit from the table and the crown facets, using precise mathematical calculations and advance optical theories of light waves based on the Refractive Index of diamond.  A well cut RBC will have more flexibility in the balance of cut, color, clarity and weight and at the same time the fire and brilliance within the stone can be maintained.
The Princess Cut is the most popular of non-round diamond.  It is also a favorite for couples as an engagement ring.  Traditionally it is square in shape, though it may not be a perfect square.  A length-to-width ratio of 1 to 1.05 would be the most perfect of a princess cut diamond.