Diamonds can be divided into colorless diamonds and colored diamonds according to their optical colors.
Colorless diamonds: The diamonds we usually see are close to colorless or yellowish in color, which is called Cape Series (or a good Mong Kok series, and most diamonds in the world belong to Cape Series).
Colored diamond: Diamonds with pure and obvious colors, which are not "nearly colorless" or "yellowish", are called color series, commonly known as colored diamond. The color series mainly includes pink, purple, gold, blue and green diamonds.
Diamonds can be divided into round diamonds and irregular diamonds according to their shapes.
Round diamond: It is the most common diamond shape, also called "ideal cut shape".
Irregular diamond: a diamond with other shapes than a circle, also known as "fancy cutting". The most common ones are oval, square, drop-shaped, heart-shaped, olive-shaped, emerald-shaped and Retien-shaped.
You can search for the detailed introduction of Iondi jewelry.