Red diamonds are rare.
The most famous red diamond, the Moussaieff Red Diamond is currently valued at US$7 million; it's a 5.11 carat stone, and the largest red diamond ever rated by the Gemological Institute of America.
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All else being equal: carat weight, cut, and clarity, a red diamond will always be more expensive than a white diamond.
By weight, when comparing equal amounts of platinum and diamond, gem-quality diamond will always be more expensive.
Stone for stone, a diamond will cost more than a sapphire.
Every diamond is valued by its clarity, colour, carat weight and cut. Compared on an equal basis, you will pay less for a black diamond.
Your answer depends on the quality of diamond you want to buy. Visit a local jeweler who can show you diamonds in your price range.
Red diamonds - are the rarest and most expensive.
All else being equal: carat weight, cut, and clarity, a red diamond will always be more expensive than a white diamond.
Probably a red diamond, since it is the most rare natural colour.
Nope. Red diamond is the most expensive. There are less than 20 natural red diamonds for sale on Earth at the moment.
Red diamonds are the most expensive in terms of money per carat, since red is the rarest colour of natural diamonds.
A diamond. That is red.
Stone for stone, a diamond is more expensive than an emerald.
The most expensive diamond, by definition, is priceless.
Platinum is not more expensive than a beautiful, natural diamond.
By weight, when comparing equal amounts of platinum and diamond, gem-quality diamond will always be more expensive.
All else being equal: carat weight, cut, and clarity, a blue diamond will always be more expensive than a white diamond.
Both are considered expensive, but a diamond is more expensive simply because it's a harder mineral.