How much should I be paying for a blue-white diamond?

OK, so a blue-white diamond is a fraudulent salesperson's way of saying "fluorescent".Fluorescence is a feature a lot of diamonds have. If a diamond is only a little bit fluorescent, that doesn't affect the diamond at all in any noticeable fashion, unless the diamond is put under ultraviolet lighting. However if a diamond is highly fluorescent, it definitely has an affect on the quality of the diamond. A very fluorescent diamond is sort of milky or cloudy looking. Very high fluorescence most definitely influences the brilliance of a diamond. Curiously, however, low fluorescence can actually improve the color grading of some diamonds, if their initial color and/or clarity gradings are low. At any rate, blue-white diamonds are a very tricky way of presenting diamonds with a property that will usually lower their value, in a better light. (Literally) FYI.

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These so-called "blue-white" diamonds are actually fluorescent diamonds. This feature should definitely not be increasing the diamond ring's price. If anything it should lower it. Though fluorescence doesn't really effect a diamond's appearance in any way if it's not terribly high, it is looked upon traditionally as a flaw, (even though most diamond dealers and gemologists admit that they don't know why that tradition came to be). At any rate, a quality fluorescent diamonds do posses is - they look bluish in ultraviolet light. If a jeweler tries to sell you a "blue-white diamond" make sure to ask to see it in natural daylight and to see the diamonds official certificate. This certificate will state that the diamond is fluorescent. If the fluorescence is low, this should not really lower the value of the diamond (shouldn't raise it either, though,). If the fluorescence is high - you should know that this affects the shine, and the diamond should cost less! Not more!
Make sure to see that certificate, and to examine your diamond in day light.

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