You could purchase a small raw diamond stone -- perhaps the size of the head of a match or a pea -- for not a lot of money.
You can shop online -- below (not endorsed by Answers.com, simply linked) -- and find raw stones in the US $100-$500 range.
If you want to purchase a small cut and polished stone, for example .20 carat, you can probably find a loose stone in the US $200 - $300 range.
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A diamond rind would cost around $160-$200
The value of a diamond depends on its cut, colour, carat weight and its clarity. A local jeweler can answer your question.
The value of a diamond depends on its cut, its clarity, its colour and its carat weight. A local jeweler can give you the answer you want.
Colour is only one criteria in the price of a diamond, others being cut, clarity and carat weight. Cut, clarity and carat weight being theoretically equal, a red diamond would probably cost the most, and a black diamond -- Carbonado -- would probably cost least. Since there are dozens of variables in diamond colours, saturations and hues, you can read more about coloured diamonds, below, and pick a group to price and rank.
Every diamond is valued according to its carat weight, colour, clarity and cut. All else being equal, an fancy intense yellow diamond will cost more than a 'white' diamond.