One factor to be looked into is the lustre of the pearl.

The Qualities of Pearls In looking or shopping for pearl jewelry, one must take into consideration certain qualities.
One factor to be looked into is the lustre of the pearl. This can be determined from the smoothness of the surface, uniformity of pearl layers as well as the amount of impurities. It is said that a pearl's lustre is its differentiating factor in determining its value.
The thickness of the pearl layers, called as nacre thickness, is also another factor to be considered. The thicker the layer the more valuable the pearl is. It is also important to determine the durability of the pearl's surface. The pearl's surface should have lesser flaws and has a smooth surface. However, it is important to note that there is no such thing as a flawless pearl.
A perfectly white coloured pearl is very precious. It is from this that the term pearly whiteEwas born. There are also pearls in pink, blue, silver and cream-coloured which are also considered attractive and are usually used in jewelleries.
Another factor to be considered when looking into jewelleries with pearls is the its shape. Pearl shapes come in eight basic shapes: round, round, semi-round, button, drop, pear, oval, baroque and ringed. Of all these shapes, the perfectly round ones are the most valuable.
Although it is not an important factor when looking at pearl jewelleries, the size of the pearl adds value to the jewellery. Two pearls with the same qualities, the bigger in size is considered more valuable.
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