The cabochon type of gemstones is also called the body type or convex type. It consists of a polished arc-shaped top surface and a rough ground but not polished bottom surface. Its main feature is that the ornamental surface is a polished curved surface.
Curved cuts are divided into three categories according to the top and bottom shapes:
Single convex type: the top surface is convex and the bottom surface is a flat surface. This is a common gem cut. Because it is placed on a flat surface like an egg, it is also known as an egg noodle gem. The height or thickness of the bulge depends on the shape of the gemstone, and there is no strict uniform rule.
Double convex surface type: The top and bottom surfaces are both convex. Geralmente, the top surface is polished, but the bottom surface is not polished to maintain the maximum quality. This type of cut is more common in natural gemstones.
Concave-convex type: The top surface is convex and the bottom surface is a concave surface. This cut makes the gems thinner, and the purpose is to increase the transparency of the gems.
The cambered style mainly reflects the reflection effect of the gemstone on light, rather than the effect of transmission and refraction. Portanto, it is suitable for the following types of gems:
Opaque or translucent gems: such as opaque turquoise, translucent emeralds, etc..
Gemstones with special optical effects: such as gems with cat-eye effect, starlight effect or color changing effect. Because these gems must be cut into a curved surface in order to show special optical effects.
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