Another mineral, graphite, also contains only carbon, but its formation process and crystal structure are very different. Graphite is so soft that you can write with it, while diamond is so hard that you can only scratch it with another diamond. On almost all modern birthstone lists, diamond is recognized today as the birthstone for April. Diamond is also the gem that marks the 60th and 75th wedding anniversaries.
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A rough diamond - Idioms by The Free Dictionary
A rough diamond is an unprocessed, unpolished diamond. Perhaps you have already held a rough diamond in your hand — and not even noticed it. The untrained eye has difficulty recognizing a rough diamond and its authenticity. When unpolished, the precious stones resemble a piece of colorless, cloudy, milky glass, or even a yellowish-brown pebble. Only when cut and polished correctly is its beauty revealed. As the saying goes: Diamonds are forever.
West Virginia governor says state is "diamond in the rough" for successful vaccine distribution
Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. At room temperature and pressure , another solid form of carbon known as graphite is the chemically stable form of carbon, but diamond almost never converts to it. Diamond has the highest hardness and thermal conductivity of any natural material, properties that are utilized in major industrial applications such as cutting and polishing tools.
Once destined for industrial use, low-quality rough diamonds were thought to have too many impurities or inclusions to be used in high-end rings, bracelets, and necklaces. But today, these diamonds are making their way into luxury jewelry. So why the sudden interest? Rough diamonds are fashionable in part because they are natural and unaltered. An additional factor in the rising popularity of rough diamonds is that they are generally less expensive than polished diamonds.