The cushion cut is an antique cut that most often resembles a cross between the Old Mine Cut (a deep cut with large facets that was common in the late 19th and the early 20th centuries) and a modern oval cut. The cushion cut is sometimes called the antique cushion-cut in recognition of its historical roots. However the Old Mine Cut had 58 facets, the modern cushion-cut has 64 facets. Today's cushion shapes are often given different faceting treatments and you will see cushion cuts with interesting checkerboard or portuguese-cut or concave facets.
The cushion cut has an open culet (the bottom of the gemstone) and a rectangular to square shape, with rounded corners and a facet plan to give the gemstone depth. This is different from today's brilliant cuts, which are cut to maximize light returned to the eye. This cut is not as fiery or brilliant as many of the newer cuts, but it has a marvelously romantic and classic look and definitely stands out from the crowd of round brilliants.
Many of the most famous gemstones in the world are cushion-cuts, including the blue Hope Diamond (45.52 cts), the Regent Diamond (140.5 cts) and the yellow Tiffany Diamond (128.54 cts). The largest cut blue sapphire in the world, the 423 ctLogan Sapphire in the Smithsonian Museum of Natural History, is a cushion-cut.
When it comes to buying a cushion cut diamond, it really comes down to personal taste. You will find cushion cuts that are nearly square, long rectangles, and with varying size tables and depth percentages. Because of the large open facets of the cushion cut, opt for the highest clarity and color your budget can afford. If you're looking for a stone that most closely matches the original cushion cut, opt for a length/width ratio of 1.25 - 1.30.
Our recommendation for buying cushion cut diamonds: