I made Three Frogs Necklace from a piece of Ox bone carved into three frogs.  You can see and feel the warts on the frogs, great carving.  I used Dark Aventurine beads with sterling silver spacers and a sterling silver connector.  This piece is approximately 24" and the pendant hangs down another 3 1/2".  Great item for all frog collectors!
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Aventurine is a translucent to opaque variety of microcrystalline quartz. It contains small inclusions of shiny minerals which give the stone a sparkling effect known as aventurescence. Inclusions of mica will give a silverish sheen, while inclusions of hematite give a reddish or grayish sparkle.
Aventurine ranges in color from green, peach, brown, blue and a creamy green. Besides its uses in jewelry, aventurine is also used for ornamental purposes like vases, bowls, and figurines.
It is interesting that the name for the stone is derived from an accident. Sometime during the 18th century, Venetian glass workers were preparing molten glass when copper filings accidentally fell into the batch producing a glass with sparkles. The name aventurine comes from the Italian "a ventura," which means"by chance".
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Folklore, Legend, and Healing Properties:
Aventurine has been used as a lucky talisman and is a popular stone for gamblers.

Legends say that it is an all-purpose healer, used to reduce stress, develop confidence, imagination and improve prosperity. A legend from ancient Tibet says that aventurine was used to improve nearsightedness and to increase the wearer's creativity.

Many believe that aventurine has the capacity to calm a troubled spirit and bring about inner peace.

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I am not a Gemologist or a Lapidary. Gemstones were identified at the time of purchase by the supplier. Any errors, discrepancies, or omissions are not intentional. All gemstone meanings, metaphysical properties and associated verbiage are not claims of fact but have been gathered from writing, books, folklore and various sources.