Diamonds come in a range of shapes and sizes, and each one has its own unique characteristics and appeal. Here is a guide to some of the most popular diamond shapes and sizes:

Round Diamonds: Round diamonds are the most popular shape for engagement rings and other types of jewelry. They have a classic and timeless look, and their symmetrical shape allows for maximum sparkle and brilliance. Round diamonds are also the most versatile, as they can be set in a variety of settings and styles.

Princess Diamonds: Princess diamonds are square or rectangular in shape and have a modern and elegant look. They have pointed corners and a faceted surface, which allows for maximum sparkle and fire. Princess diamonds are often used as center stones in engagement rings and other types of jewelry.

Cushion Diamonds: Cushion diamonds are a popular choice for vintage-inspired and romantic styles. They have a soft, pillow-like shape and a faceted surface that allows for maximum sparkle. Cushion diamonds can be found in a range of sizes, from small to large, and they are often used as center stones in engagement rings and other types of jewelry.

Oval Diamonds: Oval diamonds are elongated and oval-shaped, with a faceted surface that allows for maximum sparkle. They have a modern and elegant look and are a popular choice for engagement rings and other types of jewelry.

Emerald Diamonds: Emerald diamonds are rectangular in shape and have a faceted surface that allows for maximum sparkle. They have a classic and sophisticated look and are often used as center stones in engagement rings and other types of jewelry.

Pear Diamonds: Pear diamonds are teardrop-shaped and have a faceted surface that allows for maximum sparkle. They have a unique and elegant look and are often used as center stones in engagement rings and other types of jewelry.

Marquise Diamonds: Marquise diamonds are elongated and pointed at both ends, with a faceted surface that allows for maximum sparkle. They have a classic and elegant look and are often used as center stones in engagement rings and other types of jewelry.

Heart Diamonds: Heart-shaped diamonds are a popular choice for engagement rings and other types of jewelry. They have a romantic and sentimental appeal, and they are a symbol of love and commitment. Heart-shaped diamonds are graded on the same scale as other diamonds. A well-cut heart-shaped diamond will have a good symmetry and a balanced proportions, resulting in a beautiful and sparkling gemstone.

In terms of size, diamonds are typically measured in carats, with one carat equal to 0.2 grams. The size of a diamond can have a big impact on its price, with larger diamonds generally costing more than smaller ones. However, the overall quality of the diamond, including its cut, clarity, and color, is also important and can affect its value.