Iolite, also known as Water Sapphire, crystal tumblestones. The colour of these crystals is mid to deep blue with some having natural areas of white.
This stone prevents insomnia and nightmares.
See more tumblestones here
Size: 1.6 - 2.6 cm approx measured at the largest points
Weight: 4 - 20 grams approx
Country of origin: India