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.
This depends entirely on the diamond in question.
The normal test is to 'beep' it with a thermal diamond tester. This device measures how fast the material conducts heat and can thus tell if it is real diamond or not (diamond is the best heat conducting material at room temperature). Basically every jewelry store has one of these, so you can ask them to test it for you. Physically, if the stone appears to be clear, even though it's coloured -- and it is extremely hard, it's worth taking it in for testing. See below for photos of raw diamonds.
Testing a raw diamond at home can be challenging without the proper equipment. One common method is using a diamond tester, which measures a diamond's thermal conductivity to determine if it's real. Alternatively, you can check for imperfections or inclusions under a jeweler's loupe, though this method is less reliable. Consulting a professional jeweler is the most recommended way to accurately test a raw diamond.
All diamonds are minerals, and most all diamonds are rocks in their raw form: exceptionally hard, clear rocks.
The field test for a raw diamond is 'extreme hardness'. Otherwise, pick up the stone and take it to a jeweler, who may be able to confirm that you have picked up a diamond and not another clear mineral.
A raw diamond looks like two square pyramids attached at the base.
purple
This is a white mineral.
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.
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'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.