The most important thing to understand about diamond shapes is that it is not the same thing as cut. Diamond shape is not a grade in the 4 C’s. Diamond shape describes the form in which the stone has been created. Sometimes particular shapes such as ‘Asscher’ or ‘Princess’ also have a special cut that is only used for stones of a particular shape. Whereas a brilliant cut could be used on both round and oval shaped diamonds or a step cut could be used on both baguette and emerald shaped diamonds.
There are a multitude of diamond shapes available and new ones are being innovated all of the time. The most common shapes that are used are round, oval and square. Antique cushion cuts with rounded corners in either square or rectangle are also popular right now.
For certain shapes there are considerations you will want to make when setting to protect the stone. For example, for shapes with sharp, vulnerable corners such as square princess or marquis you’ll want to ensure that those corners are covered and protected in the setting. Another example would be the soft square antique cushion shaped stone. If using a prong setting, the stone could potentially shift in the setting due to its shape so it’s better to use either a double prong or bezel to set this shape of stone.
When selecting your diamond shape you’ll want to keep in mind which one works best for your design. Some diamonds definitely work better than others for some designs. If you prefer a unique shaped stone such as a marquis or trillion it is better to first select your stone then create the design for your jewellery piece.