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Blue Sapphires—or Neelam, as they are known in many cultures—are more than just stunning gemstones. They are symbols of wisdom, royalty, and, for some, intense astrological power. Because they are highly valuable, the market is unfortunately flooded with synthetics, glass-filled stones, and "look-alikes." If you are looking to invest in one, you don't need to be a professional gemologist to spot the red flags. Here is how you can tell if that sparkling blue stone is the real deal.