Beads range from about 9mm to 16mmm in diameter. Who doesn't love a luxurious coin, sparkling coin? Our high-quality smoky quartz makes the best of this classic shape with a moderately light tone that is sure to catch the eye in elegant design. Bead size is slightly graduated to provide the opportunity to use the whole strand in a truly exquisite necklaces. Fans of the gemstone should explore the myriad design possibilities found with this gorgeous option.