Emeralds belong to the same class of gemstone as the aquamarine;they are beryls. The green color in the emerald comes from chromium. Emeralds are one of the four so-called "precious" gemstones, along with diamonds, rubies, and sapphires.
It is very difficult to find a "perfect" emerald since almost all of them have inclusions. And finding pretty emeralds in the form of beads is especially difficult, since most of the least-included emeralds are used for cut gemstones. Most emerald beads are quite heavily included or opaque (or often both). Even included and imperfect, I still adore emeralds.
One of the reasons I love emeralds is because they are very versatile. Emeralds look very good when combined with other gemstones, both precious and semi-precious. The emerald bracelet shown above and below also has neon blue apatite and rubies with sterling silver.
The emerald bracelet shown in the next two pictures, below, features neon apatite rondelles and peacock blue apatite coins.
Of course, plain emeralds, here they are in the form of faceted nuggets and smooth coins which are quite rough, are a classic on their own with just a touch of gold or silver. In this bracelet, the faceted nuggets are accented with 14 karat gold-fill.
Little faceted opaque emerald rondelles dangle from these sterling silver chandelier earrings.
In the emerald earrings below, bezel-set opaque cabochon emeralds hang from sterling silver earwires each decorated with a single flat heart on its front. Hammered sterling silver rings hang below the emeralds.
Two emeralds piggy-backed and surrounded by sterling silver make the perfect precious pendant necklace. The flat faceted emerald nugget is a favorite shape of mine. The dark inclusions add to the texture and interest of the gemstone.
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For more about emeralds, see Emeralds: The May Birthstone