Today, there are 2 kinds of pearls such as sea pearls and fresh water pearls with similar of the sharpness. But sea pearls are more value of 10 times than fresh waters.
The customers are difficult to distinguish sea pearls and freshwater pearls in the market. It will made a confusion to the customers when they buy fresh water pearls with sea pearl price.
There are 5 basis factors to recognize Sea Pearl and Fresh water Pearl
1. Color and brightness
During time of nucleation in the sea with high minerals and siphon, sea pearls will have brilliant luster, sparkle, shining and refraction and to create a rainbow shining.
Fresh water pearls often has bright color, streak and not identical color. Therefore, engineering have to entirely bleach pearl and dye color to create nice color and perfectly fresh water pearls. Besides that, fresh water pearls fed by germ. Shapes of fresh water pearls are not round. They have to polish pearls to get the perfect one.
To distinguish sea pearls and fresh water pearls by comparison thosein many different conditions or can see it more clearly when pearls were wet. Under impact of refraction, sea pearls are totally to stand out and difference to the chemical color of fresh water pearl.
Pearls hardness was measured by Mohs (Mohs measurement applied for Diamond and gemstone. If sea pearls get 3,8-4.5Moha, fresh water pearls will be 1.8Moha (According to American mineral association)
Sea Pearl nucleus made from the shell from Mississippi River. Fresh water peal nucleus was made from small and soft cell. That’s the reason why the shape of fresh water pearlsoften are not round and have to polish fresh water pearls to get the perfect one. Therefore, the nacre of fresh water pearls are unstable and easily to dimorphism and spelling off under external environment.
3. Lustrous Nacre
Nacre thickness is one of element for making price of sea pearls. Usually, each oyster can make only one sea pearl after around 24-36 months from the time of nucleation.
To the fresh water, nacre thickness is not an importantelement. The nucleation process of fresh water pearl is quite different from sea pearl. Therefore, oyster in the river will be inserted with many square mussels with 3mm at the same times for nucleation.
Due to the low nutrition in the river and short-time nucleation, nacre of fresh water pearls has low quality.
Shape of fresh water pearls are not round as sea pearl water because of nucleation by soft and small tissues. The common shapes of fresh water pearls are oval, baroque, button, drop…
While sea pearls have only near round to round shape. Even, the bigest freshwater pearls cannot get a round shape as sea pearls.
Lasting the culture time, the pearls will get thicker nacre, bigger size and more value. To the sea pearls, the oysters will produce a pear after average 2 or 3 years depending on nucleus such as Akoya pearls (12 – 18 months), South Sea and Taihiti (48-60 months)
To the fresh water, oysters will produce many pearls at the same time and within 6-12 months from the time of nucleation. They always have small size and low quality compared to sea pearls.