Tourmaline Ring Puzzles The flexible yet durable plastic

The flexible yet durable plastic tiles interlock quickly and easily for all skill levels

Features 15 projects that progressively build artistic skills

durable plush for comfort and play

A combination of mathematics

Tourmaline Ring Puzzles The flexible yet durable plasticThis ring features natural tourmaline gemstones set in sterling silver. Tourmaline is a complex borosilicate mineral that occurs in a wide range of colors, often forming elongated, striated crystals. Details: Material: Natural tourmaline set in sterling silver (92. 5% silver, 7. 5% copper) Appearance: Vibrant, polished stone, color may vary from pink, green, or multicolored Formation: Forms in igneous and metamorphic rocks through boron rich fluids