• Brilliant or Round  A faceted cut that produces the greatest brilliance in a diamond.
• Marquise  Resembles an oval that tapers to points at both ends.
• Princess  A modified brilliant square-cut diamond.

• Pear  A pear or teardrop with a point at one end.

• Emerald - Usually rectangular, but sometimes square cut, The stone is cut with rows of facets along the edges and corners that resemble stairs

The 4 c's of gems 

1. Cut(not Shape)
2. Clarity
3. Carat (Weight)
4. Color