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In this guide, you'll learn to recognize quality and understand value when choosing the type of pearl that's right for you.
In every 10,000 oysters, you might be lucky enough to find a single natural pearl. Because of this scarcity, most pearls today are cultured pearls. A tiny bead is implanted in an oyster, so that it is gradually coated in layers of a beautiful, pearlescent substance called nacre which build up to create a lustrous pearl.
At Blue Nile, we offer beautiful Freshwater, Akoya, South Sea, and Tahitian cultured pearls. Below, read about the qualities that define a fine pearl.
Pearl Color
Color
The general color of a pearl is also called the body color. Typical pearl colors are white, cream, yellow, pink, silver, or black. A pearl can also have a hint of secondary color, or overtone, which is seen when light reflects off the pearl surface. For example, a pearl strand may appear white, but when examined more closely, a pink overtone may become apparent.
Luster
Pearls produce an intense, deep shine called luster. This effect is created when light reflects off the many layers of tiny calcium carbonate crystals that compose the pearl. This substance is called nacre. When selecting a pearl, consider that the larger the pearl, the more nacre it has, so it will also exhibit even more luster. Compare a 5mm Freshwater cultured pearl with a 10mm South Sea cultured pearl and the difference in the amount of nacre is obvious. The difference in luster is as clearly visible as the difference in the pearl sizes.
Pearl Shape
Shape
At Blue Nile, we offer the highest quality, rarest pearl shape – round. Shapes that are not spherical or even symmetrical are considered lower quality. Akoya, Tahitian, and South Sea pearls found in jewelery have a tendency to be the roundest, while Freshwater pearls can be oval or slightly off-round.
Surface MarkingsAs an oyster creates a pearl, the layers of nacre do not always adhere smoothly. Sometimes spots and bubbles can appear in the layering process. Pearls with the smoothest surfaces are the highest-quality, most sought-after pearls. At Blue Nile, to offer you a range of prices, we offer pearls with a range of surface qualities.
Pearl Size in Millimeters
Size
The size of the pearl greatly depends on the type of pearl. Freshwater pearls range in size from about 3.0–7.0mm, Akoya pearls range from about 6.0–8.5mm, and South Sea and Tahitian pearls can reach sizes as large as 13mm.
Choosing The Right Peal
Now, read on to learn the differences between the different types of pearls, and learn the levels of quality you can expect from each type.
