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.
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 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.
blue
All else being equal: carat weight, cut, and clarity, a blue diamond will always be more expensive than a white diamond.
All else being equal: carat weight, cut, and clarity, a red diamond will always be more expensive than a white diamond.
A black diamond won't sparkle like a white diamond, but a very special black diamond, the Amsterdam Black Diamond is apparently a visually stunning stone. Read more, below.
it will glow white, or more than likely, blue
Every diamond is individually graded/ priced according to its colour, cut, clarity and carat weight.All other variables being equal, you will generally pay more for a coloured diamond, than for a 'white' diamond. Exceptions can be brown or black diamonds or other lessdesirablecolours.
in some cases yes but only by a fraction
Stone for stone, a diamond is more expensive than an emerald.
Stainless steel dishwasher are more expensive that white or black models.
Platinum is not more expensive than a beautiful, natural diamond.
Given the same carat weight, clarity and cut, you will pay more for a pink diamond than for a 'white' or colourless diamond.
By weight, when comparing equal amounts of platinum and diamond, gem-quality diamond will always be more expensive.
All diamonds regardless of colour, have an equal hardness. Note, however, that carbonado, or black diamond, is more porous than white diamond.