All the pearls available and sold in the market are all cultured pearls and grow naturally in oysters. We humans have no control over its growth but generally longer the period it takes to harvest, oysters tend to grow larger sizes. But its not the thumb rule. Their harvesting time varies from 2 to 5 years. Harvesters keep checking the oysters many times during its growth period. There are various types of pearls, Fresh water pearls, Akoya sea water pearls, South sea water pearls and Tahitian pearls.

Pearls are measured in millimeters thru diameters. Pearls come in various sizes generally from 3mm to 24mm but the most popular sizes are between 6mm to 8mm. Lower sizes does not mean they are always cheaper than the large ones because a very good quality small size pearl may command a higher price than the lower quality of 8mm or more. Sizes 6mm-7mm are generally preferred by young girls and are very popular. Sizes 7mm-8mm are equally popular in demand and are preferred choice by many working women and professionals alike.

Size 8mm or bigger usually are in higher price range and very good choice for career women and go also well with evening gears. But again, it all depends upon individual choice, taste, style and above all affordability. Size alone is never a sole factor when it comes to buying. The color, quality and the type of pearls such as Freshwater pearls, Japanese Akoya seawater pearls, Tahitian pearls or South Sea pearls also are other important considerations.