Show I 1 color luster shape determine pearls value four factors determine the alue of a pearl color luster shape and size according to an authority in the washington star while many kinds or of oysters make pearls the kind in dema demand nd are a few only made by mollusks possessing a special type of shell with an inner lining of mother of pearl that Is a lining with a fine iridescence this same iridescence Is imparted to the pearl giving it the rare beauty desired in gems while pearl colors are largely a matter of individual taste most people seem to prefer the white stones but to the true expert the pink pearl of a one fine d delicate e I 1 ca te tint Is most desirable golden colden yellows and greenish blacks are also hl highly bly prized by connoisseurs the technical term for the characteristic pearly luster is orient this exists in fit various intermediate stages beta meen ten dull faull and bright if a pearl has tile the finest orient that Is an unusually brilliant brilli int one it might be worth many times the value of the same sized pearl with inferior luster large sized pearls of exceptional quality are exceedingly rare generally speaking the most desirable shape Is a perfectly spherical pearl |