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By Kevin P. McVay Have you ever thought about adding color-changing gemstones to your jewelry collection? We鈥檙e not talking about well-known colored gemstones like rubies, sapphires or emeralds, but gems鈥攕uch as opal gemstones鈥攖hat actually change color depending on the lighting. From rings to pendants and everything in-between, color-changing gemstones, known as phenomenal gems, are unique and go well with many types of jewelry designs. Here are some of our favorites: Alexandrite This rare gem was discovered in 1834. During the day, it beams green or bluish-green. In incandescent light, it turns to a soft shade of red. The Alexandrite鈥檚 optical