Natural vs. Cultured
Gem-quality natural pearls are quite rare because those produced by mollusks are not always good enough for jewelry. Other than that, some of the shapes are not acceptable. There are also a very small number of harvestable natural pearls available which is why jewelers turn to cultured pearls, which are easily produced in the desired shape and size and conveniently harvested.
Natural pearls are generally not superior in quality and value to cultured pearls, although the perfectly round natural pearl is the most prized because of its rarity. The only difference between the two types is their method of production. Both are actual pearls.
Choosing a good quality pearl
Pearls are prized depending on several factors, a combination of which can greatly affect their price:
Color – is determined based on two things: the body color and the overtone. The body color is the main color of the pearl, which can range from the more common white, cream and silver to green, gold, blue and black. The body color depends on the kind of oyster the pearl was produced with as well as on the water conditions prevailing at the time of its production.
The overtone is the translucent color/s that you can see on top of the body color, although there are pearls with no overtones. Imagine the pearl as a colored ball and imagine an overtone as a colored plastic wrap over it. The overtone can add to the luster and depth of the pearl and can change its main color a little. For example, a pearl may have a cream color with pink overtones.
Size – generally speaking, the larger the pearl, the more valuable it is. Size is measured in millimeters and determined by the pearl's diameter.
Shape – pearls come in a wide array of shapes: the spherical (round and near-round), symmetrical (oval, button and drop or pear-shaped) and baroque (irregular and non-symmetrical).
Luster – pearls are reflective gemstones. The higher its luster quality, the more it can reflect light and surrounding images and the more brilliant it is. Luster is dependent upon the quality and amount of nacre that the pearl contains.
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