Luster is rated from low to high. High luster is when the nacre is thick and well-formed, the pearl may appear to glow from within. Luster is dependent not mainly on nacre thickness but on the quality of the nacre. One of the most important factor that will effect the market price of a pearl will be its size. It is important to note that it is the nucleus size, not the growth process that largely determines the end size of the pearl.
Buyers have different preferences, with some opting for white-rose while others prefer silver white.
Fine cream rose pearls have also been considered by many as the best color. In any case all pearls will exhibit a basic body color such as white, cream, gray or yellow, as well as an overtone color such as rose, silver, green or blue. During the cultivation process, natural entities will loge themselves to the forming pearl, sending new nacre around the protruding area. As with any gem material, the size, location and nature of imperfections will greatly influence the value of the item. Cultured pearls showing pits.