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Summary: Blue diamonds are desirable because of the way they catch the light, and a truly blue diamond is very rare. Understand what makes a diamond appear blue with information from a successful jeweler in this free video on diamonds.
Upon graduation from NC State University in 1977 with a BA in Business Management, A. Scott Rhodes received his Graduate Diamond degree from the Gemological Institute of America (GIA)...read more
"There is a strong demand for blue diamonds. That's the epitome of the diamond. That's the creme de la creme of diamond colors is blue. Kind of don't want to confuse the blue-blue with, like, the Hope Diamond is a blue, beautiful navy blue. That's extremely rare. That's almost never seen, particularly in the size that that stone was. But you have lighter colored blue diamonds with just a hint of blue, like...almost like a powder blue -- like, just a little bit of blue, which really raises the prices up. Now, some diamonds in the sunlight will appear blue, but it's actually a purplish color, and that's termed fluorescents -- just like things that...day-glow paints and such under black light. Under black light, these stones can appear purplish, and that's, to most people, particularly the diamond dealers, a very undesirable trait. But yes, in general, blue diamonds are...they're fabulous. For someone to own one is really a super-duper thing. It's mostly movie stars and such. It's whatever mineral...the prevalent color of minerals or lack thereof...lack thereof would indicate that the diamond formed, you know, under perfect conditions with no introduction of chemicals and minerals. And therefore, it's perfectly white, which a top-grade white stone is really...looks blue. It looks blue. And the reason it looks blue is because the...there is more blue in the spectrum of light than any other color, so as a light transmits through that diamond, the diamond takes upon a blueish appearance because that color is prevalent."
eHow Article: About Blue Colored Diamonds
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