culet
An unmounted gem is typically referred to as a loose gemstone. It is a gemstone that has not been set into a piece of jewelry, allowing for flexibility in how it can be used or set.
a broad area of flat or gently rolling land is called a plain.
An isolated flat elevation of land is called a plateau. Plateaus are elevated areas of flat terrain that are higher than the land surrounding them, but have a relatively level surface on top.
Low flat areas of land are called plains. Plains are characterized by their relatively flat, expansive landscapes with minimal elevation changes. They often support diverse ecosystems and are used for agriculture or development.
The flat part of the ocean floor is called the abyssal plain. It is a smooth, flat region that lies between the continental rise and the mid-ocean ridges.
Table
According to my son's math homework a flat surface on a solid is called a face
Each flat face of a 3d object is called a face or a polygon!
It's called a face
It is a face of the polyhedron
If you are a cube, one of the sides is called a face. Same with a cone, the flat part is a face.
The prone position is lying flat on your front, face down. Lying flat face up is called prostrate.
A gemstone that has been cut and polished is called a faceted gemstone. This process enhances the gem's color, clarity, and sparkle by creating flat, polished surfaces known as facets.
it's called a face
The surface of a crystal is called a flat face or a facet.
Face.
A Purple Gem is called a Amethyst