The first characteristic to consider when choosing a diamond is the shape of the stone. While classic round, oval and princess shapes are the most popular, diamonds also come in a wide variety of unique shapes such as pear, emerald, marquise, cushion, square and more.

Most people have a preference to the shape they want their engagement ring to be, so, if at all possible, try to find out what it is. Consider what type of diamond shape would suit the size, width and length of the ring finger of the receiver.
Some shapes, such as the pear or marquise can make a diamond appear larger and elongate the appearance of the fingers due to its length to width ratio, which is important to consider if you need to compromise on the actual carat size but want the illusion of a bigger stone.

Choosing the right shape sets the foundation for considering all other elements of your engagement or wedding ring.