Insofar as gems are concerned, there are several semi-precious and outright fake objects that can be 'alternatives' to a diamond. Quartz, white sapphire, zircon, moissanite, and glass.
Insofar as industrial use for diamonds -- about 80% of all diamonds mined are industrial diamonds, there are no natural substitutes. However, there are man-made, lab-created alternatives: man-made diamonds.
Since not all of the diamonds in the earth have been unearthed, it is not possible to post a number that has any validity. Natural red diamonds, however, are the most rare of naturally coloured diamonds.
Well Blood Diamonds are normal diamonds that have been fought for, like in a war if there were diamonds and people killed other people for them, then they are blood diamonds. (they are not red as some people think). So any mineral company will buy a 'Blood Diamond' for more than a ordinary diamond, . :)
Tanzanite is found in an area where there are no diamonds. Natural tanzanite is endemic only to the Mererani Hills of Northern Tanzania.
Humans mine for diamonds for the same reason that any human industry takes a natural resource from the earth: to make money.
Without a weight for any of the gems in your question, it is not possible to name a single jewel that balances three diamonds.
No there isn't any healthy alternatives to steroids
Carrots are good alternatives for vitamin c.
No. Diamonds are formed from carbon.
Mined diamonds are superior to any man made diamonds.
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There are no diamonds mined in any European country.
You can purchase diamonds in most any city in the world. There is no 'city' where diamonds are mined, however.
Diamonds are found in diamond mines in Africa, unless you're shopping for diamonds. If the later, you can visit any jewelery story in any city in Africa that sells diamonds and find them there.
No. Diamonds are gemstones; jewelery can be any accessory adornment.
Yes, diamonds are a form of carbon.
Diamonds can be cut into almost any shape.
Because diamonds are harder than any metal.