A wedge-shaped stone placed at the apex of a masonry arch is called a keystone. During construction of the arch, the keystone is the final piece to be placed.
A stone can be shaped with a stone grinder. A stone is placed in the grinder and then a person will maneuver the grinder to shape the stone the way they want it.
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A Stone
A stone block is generally cut from a single piece of stone.
The common term for a single mosaic piece it tessera, but can also be called abaciscus or abaculus. Each piece is made of a single small tile, which is usually cube shaped. Tesseras are usually made from clay, ceramic, stone, glass, or mirror.
No it was usually carved from a piece of granite
The colorful piece of stone (part of the Aztec Sun Stone) is on top of Edison's house (1877 AD). Return it to 1519 AD.
stone shaped spears
A stone is typically cut and shaped into a specific design or shape, then polished to enhance its appearance. It may be mounted in a setting, such as metal prongs, to create a piece of jewelry. Finally, it may be embellished with other gemstones or metals to create a finished piece.
It is chip
I know that the top stone, is called a Key stone.