The Smoky Quartz gemstone is the brown and ‘smoky’ variety of Quartz ranging from light grayish-brown to deep black in color and believed to possess properties of optimism, strength, and stability.
Source : Gempro Gems
This would be called a gemstone.
topaz
Indiana's gemstone is the salem limestone.
The surface of a gemstone is called a facet. Facets are the flat, polished surfaces of a gemstone that refract light and create its sparkle. The number and shape of facets on a gemstone can vary depending on the type of gemstone and the desired cut. Here are some other terms that are used to describe the surface of a gemstone: Table: The flat, polished top surface of a gemstone. Pavilion: The bottom surface of a gemstone, opposite the table. Crown: The upper portion of a gemstone, between the table and the pavilion. Girdle: The narrow band that separates the crown and pavilion. Culet: The small, pointed bottom tip of a gemstone. The surface of a gemstone can also be enhanced by a variety of treatments, such as tinting, foiling, and waxing. These treatments can improve the color, clarity, or brilliance of a gemstone.
Tiger's eye is a type of gemstone that is identified by it's red or brown color with stripes. This gemstone is a member of the quartz group and is not considered rare.
neelam
Faces or facets.
green
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.
Yakut stone is called "ruby" in English. It is a red gemstone known for its vibrant color and high value in the gemstone market.
Emerald is a precious stone. Enstatite is a rare brown-green gemstone.
The sunken design on a gemstone is called a cabochon. This design showcases a smooth, domed surface on the gemstone, rather than a faceted or angular cut. Cabochon-cut gemstones are often used in jewelry to highlight the stone's color and texture.