Opals come in various types, each with its own distinct characteristics and price range. The most sought-after and valuable type is the precious opal, which displays a vibrant play of colors. This type of opal is further classified into three categories: black opal, white opal, and crystal opal. Black opals, with their dark body tone and vivid play of colors, are considered the rarest and most valuable. White opals, on the other hand, have a lighter body tone and a softer play of colors. Crystal opals, known for their transparency and intense color play, fall between black and white opals in terms of value.