Uncut unshaped diamonds look like shiny black coal
Uncut diamonds can be formed into pyramid-shaped stones, sometimes with the bottoms of two pyramids joined at the base. However, most uncut diamonds are irregular in their shape. Gem-quality stones are transparent and coloured raw diamonds are clearly coloured and transparent.
Diamonds come out of the ground looking like rough, unpolished crystals. They may appear cloudy, dull, and in various shapes such as octahedral or cubic. The raw diamonds have a rough texture and must be cut and polished to reveal their natural sparkle and beauty.
You can review the link below to view images of raw diamonds. Remember, about 80% of all diamonds mined are industrial diamonds and only 20% qualify as potential gemstones.
Common one are a green and are not clear.
Black diamonds are diamonds, but they are black, and not transparent. Follow the link, below, to see photos of black diamonds.
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.
Faceted, finished brown diamonds are simply diamonds within that colour range. Chocolate diamonds are an intense brown colour.
It has scars all over it.... =( this answer must come from someone who is uncut.=)
Out of the ground they look like little rocks/crystals. It is only when they are cut and polished that they look like they do in a ring.
You can learn more about diamonds and their visual dazzle, below.
It looks kind of like smoky or clear rock... sort of like dirty glass chunks.