Pearls are unfortunately never an investment

If a pearl is nucleated with a bead there is a limit to the nacre layer. As you use the pearls, little by little the layer of nacre will disappear. If you treat them well you probably won't notice. But if you have modern day akoya with a thin layer of nacre, eventually the implanted bead will show. Then the pearl is worn down and is only fit to be thrown away.
The process of the nacre wearing slowly away is the main reason why I call pearls a commodity. I compare it to new cars. They cost money to buy, you never get the money back, and eventually they are worn down. But who doesn't want a great looking car?

Not all can be measured and counted. You buy pearls because you love them.

MIKIMOTO 的珠主要是ＡＫＯＹＡ。海水珠的一种。也有其它种类的。
南洋珠　（South Sea Cultured Pearl），是大珍珠，尺寸一般在１０mm 以上。
AKOYA珍珠和南洋珠是同一个品种，都是产于马氏贝，只不过是产地不同！South Sea Cultured Pearl 跟淡水珠比，一贝一珠，要养好久才长大，所以贵。