Rare gemstones are beautiful, shine bright, and give gorgeous color. When choosing your rare sapphire, ruby, emerald, or other precious gemstone, there are a few important things to keep in mind. Use the 4Cs when finding the perfect, quality rare gemstone: cut, color, carat weight, and clarity, make sure they are certified from a reputable body, and their origin, are they natural or lab grown gemstones. But buying a rare gemstone doesn’t have to be daunting.Â