Make your designs stand out with contemporary style using the Dakota Stones sardonyx 30x40mm rectangle beads. Available in 8-inch strands, these beads feature natural white stripes against a mysterious black background. These large beads are rectangular in shape and have rounded edges. Sardonyx is an onyx that is characterized by parallel lines of sard and different colored minerals. It is a distinct and dramatically banded variety of chalcedony composed of quartz layers. Sardonyx is believed to improve memory and increase one's analytical talents. Sardonyx is mined all over the globe and is also known as tuxedo agate. These beads would make excellent focal pieces in a dramatic necklace design.
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