Very variable - some just look like lumps of dirty stone, while others have a visible octahedral shape and plenty of sparkle. Some look like little sugar cubes. The reference below has some photos of specimen examples. The largest diamond ever found (The Cullinan or Premier Diamond) appeared pretty unspectacular as it had no crystal faces and an eroded surface - see the second reference for a picture.
A raw diamond looks like two square pyramids attached at the base.
purple
This is a white mineral.
Very variable - some just look like lumps of dirty stone, while others have a visible octahedral shape and plenty of sparkle. Some look like little sugar cubes. The reference below has some photos of specimen examples. The largest diamond ever found (The Cullinan or Premier Diamond) appeared pretty unspectacular as it had no crystal faces and an eroded surface - see the second reference for a picture.
You can click the links, below, to view photos of a raw diamond and of a polished diamond. Their are many diamonds that appear to look like their real. The best way to tell is to put the diamond in a bright light. If the diamond only gives off a little sparkle and shine it most likely is not real.
You can review the site, below, to see a replica of the raw stone and the named stones cut from it.
You're asking about a raw diamond, one that has not been cut or polished. In context, sometimes a raw diamond's "... eight corners are truncated by the eight faces of the octahedron." This is one description of a diamond's raw, crystalline form. You can read more about the geometric descriptions of raw diamonds, below.
Industrial raw diamonds are much less expensive that gem-quality raw diamonds. You can visit the site, below, and look for the raw diamond that you want to buy.
In its raw form, plutonium is a silvery-gray metal that tarnishes when exposed to air, turning dull and eventually forming a yellow oxide coating.
Some raw diamonds are shaped like a pyramid, and some like two pyramids joined at the base. However, not all raw diamonds have these facets. In truth, the sides of raw diamonds are not properly known as 'facets', because the plane of the side is rarely absolutely flat, until it is cut and polished by a diamond cutter.
The proper words are raw diamond, raw stone, rough diamond, uncut diamond -- all are appropriate.
You can click the links, below, to view photos of a raw diamond and of a polished diamond. Their are many diamonds that appear to look like their real. The best way to tell is to put the diamond in a bright light. If the diamond only gives off a little sparkle and shine it most likely is not real.