Pearl is an organic gem, and its composition is calcium carbonate. Organic gemstones will slowly age, change color and lose luster over time. The maintenance of organic jewelry should reject strong acid and alkali substances. For example, take it off in the shower, rinse it with water after sweating, and wipe it carefully with flannel. Avoid splashing on pearls when wearing perfume. Generally speaking, if properly maintained, the life of pearls can be as long as 150-200 years. So of course your black pearl won't lose its luster so soon. Ha ha.