Cushion diamonds feature a square cut with rounded corners. This classic cut has been around for almost 200 years. It was the most popular diamond shape for the first century of its existence, similar to round cut today. Another interesting fact is that until the early 20th century, the cushion cut was the de facto diamond shape.
Cushion Diamond Cut Guide
Cushion cut standards vary more than most other shapes and personal taste dictates the choice. Cushion diamonds generally have less brilliance than round diamonds, however, they often have a better fire, which makes them so attractive for buyers.
Use the chart below to evaluate the cut of cushion diamonds.
|TABLE %||61 - 67||58 - 60 or 68 - 70||56 - 57 or 71||54 - 55 or 72 - 73||< 54 or > 73|
|DEPTH %||61 - 67||58 - 60.9 or 67.1 - 70||56 - 57.9 or 70.1 - 71||54 - 55.9 or 71.1 - 73||< 54 or > 73|
|GIRDLE||Very Thin to Slightly Thick||Very Thin to Slightly Thick||Very Thin to Thick||Very Thin to Very Thick||Extremely Thin to Extremely Thick|
|CULET||None||Very Small||Small||Medium||> Medium|
Cushion Diamond Ratio Guide
Classic cushion cut diamonds come in a square shape with a length to width ratio of 1.00. However, they are often found in slightly rectangular shapes as well. The most popular rectangular shape is of 1.10 – 1.20 length to width ratio.
The chart below serves as a guideline for evaluating the ratio of cushion cut diamonds.
|SQUARE||1.00 - 1.03||1.00 - 1.03||1.04 - 1.05||1.06 - 1.08||> 1.08|
|RECTANGLE||1.15 - 1.20||1.10 - 1.14 or 1.21 - 1.30||1.10 - 1.14 or 1.21 - 1.30||1.08 - 1.09 or 1.31 - 1.50||< 1.08 or > 1.50|
Cushion Diamond Colour Guide
Evaluating colour in cushion cut diamonds is subjective like for all other shapes. Many people may actually prefer slightly warmer colours of G-H range over the cool colourless diamonds of D-F colour range.
The colour chart below provides a general guide for evaluating colour in cushion cut diamonds.
|< .50 ct.||D - G||H - I||J - K||L - M||> M|
|.51-1.0 ct.||D - F||G||H - I||J - K||> K|
|1.0-2.0 ct.||D - F||D - F||G - H||I - J||> J|
|> 2.0 ct.||D - F||D - F||G||H - I||> I|
Cushion Diamond Clarity Guide
Evaluating clarity in cushion cut diamonds is subjective as well. It’s important to understand that each customer has a unique standard for clarity. Some may feel comfortable with inclusions as long as they are not eye-seen, others are ready to pay a much higher price for flawless stones.
The clarity chart below provides a general guide for evaluating clarity in cushion cut diamonds.
|< .50 ct.||FL - VS2||SI1 - SI2||I1||I2||> I2|
|.51-1.0 ct.||FL - VS1||VS2 - SI1||SI2||I1 - I2||> I2|
|1.0-2.0 ct.||FL - VVS2||VS1 - VS2||SI1 - SI2||I1||> I1|
|> 2.0 ct.||FL - VVS2||VS1 - VS2||SI1||SI2||> SI2|
Cover image credit: The Clear Cut