Fancy colored pearls are flattering to everyone. Luster Luster is the most important factor in choosing pearls. The inner glow of the pearl combined with the surface brilliance defines luster. The higher the luster, the thicker the nacre or secretion from the oyster and the stronger the glow. You should be able to see your reflections clearly on the surface of a pearl.
Lower quality cultured pearls appear too white, dull or chalky.
Surface The smoothness of the pearl's surface, from clean to heavily blemished, is the next consideration. Cracks or breaks in the nacre are considered damage and can contribute to the deterioration of the pearl. Because pearls are grown in an oyster and are organic gems they are almost never flawless. The gem-quality pearl may have minute blemishes when examined very closely, but they are not noticeable at arm's length. Similarly, it is very rare to find a perfectly round pearl.