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If you are looking for a very unique audemars piguet royal oak 15300st001220st0 mens watch gift for a romantic partner, a cherished friend or a dear relative then a blue diamond necklace might be just the thing. It is an especially wonderful gift for any woman who happens to love or suit the color blue. It is also the perfect present for a female who has piercing blue eyes.If you are female you might even want to treat yourself to a blue diamond necklace, especially if you want to celebrate getting a promotion, reaching your target weight after a diet or giving up and unhealthy vice such as smoking.If you wanted to really indulge yourself you could even purchase a blue diamond bracelet to match the necklace. After all there is nothing at all wrong with rewarding yourself for a job well done by buying an item of audemars piguet royal oak 15300st001220st0 mens watch or two that you have always wanted.The PriceA genuine blue diamond necklace made out of natural jewels is a very rare thing indeed. Naturally occurring blue diamonds do exist but there arent many of them and they are ridiculously expensive. Unless you are a multi millionaire then you will not be able to afford to buy a blue diamond necklace made of natural unprocessed gems.In the vast majority of cases any blue diamond necklace you find available for purchase at a fine jewelry retailer will be made out of gemstones that have been treated to give them their color. These diamonds are originally gems with a yellow or brown tint, but the pigment is no longer visible after the color has been added.Diamonds chosen for this kind of treatment may not start out with the best color but they do have excellent clarity because any inclusions are more obvious in blue gemstones. A blue diamond necklace that has been enhanced costs as much if not more than one that has regular diamonds.The extra expense is due to the fact that the treatment required to give the diamonds their blue color is costly. Obviously the cost of a necklace also depends on the cut, clarity and carat weight of the blue diamond or diamonds it has.Why They are Better Than Sapphire NecklacesYou may be wondering why one would bother purchasing a blue diamond necklace rather than one that contains sapphires given that the color is the same. There are actually three valid reasons for choosing a blue diamond audemars piguet royal oak 15300st001220st0 mens watch over one containing sapphires.