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.
Stainless steel dishwasher are more expensive that white or black models.
Stone for stone, a diamond is more expensive than an emerald.
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.
An opaque white appearance under a black light may indicate that the diamond is not a true diamond but could be a simulant or synthetic stone. Natural diamonds typically do not fluoresce strongly white under ultraviolet light. It would be best to have the diamond examined by a professional gemologist for a more accurate assessment.
Carat for carat, no gem is more expensive than a diamond, given a superior cut, clarity and colour classification. Other gems can be more expensive than diamonds when the diamonds lack top qualities.
By weight, when comparing equal amounts of platinum and diamond, gem-quality diamond will always be more expensive.