Diamonds come in a variety of shapes, each with its own unique appearance and characteristics. 

Some of the most popular diamond shapes include:       

    a. Round: Round diamonds are the most popular shape and are known for their brilliance and fire. They are ideal for those who want a classic, timeless look.

     b. Princess: Princess diamonds have a square or rectangular shape and are known for their sharp, angular lines. They are a popular choice for engagement rings and other jewellery items. 

     c. Emerald: Emerald diamonds have a rectangular shape with cut corners and are known for their elegance and sophistication. They are often used in vintage-style jewellery.

     d. Asscher: Asscher diamonds are similar in appearance to emerald diamonds, but have a more octagonal shape. They are known for their unique, Art Deco style.

     e. Oval: Oval diamonds have an elliptical shape that is known for their brilliance and fire. They are a popular choice for those who want a classic look with a modern twist.

     f. Pear: Pear diamonds have a teardrop shape and are known for their unique, timeless beauty. They are a popular choice for pendants and other jewellery items.

     g. Marquise: Marquise diamonds have a boat-shaped appearance and are known for their elongated appearance. They are a popular choice for those who want to make a statement with their jewellery.

When choosing a diamond shape, it is important to consider your personal preferences, as well as the intended use for the diamond. For example, round diamonds are often the best choice for engagement rings due to their classic and timeless appearance, while princess diamonds are a popular choice for earrings and other jewellery items.

The shape of a diamond can also affect its appearance and value. For example, round diamonds are highly valued due to their brilliance and fire, while pear and marquise diamonds are often valued for their unique, eye-catching appearance. Additionally, certain diamond shapes, such as round and princess, may be more in demand and therefore, more expensive than others.

Ultimately, the right diamond shape for you will depend on your personal style and preferences, as well as the intended use of the diamond. It is important to carefully consider your options and choose a shape that you love and that suits your needs.