The Swarovski 4499 Fancy Stone, the Kaleidoscope Square, is a contemporary interpretation of a classic shape. This kaleidoscope optic is created by a rivoli faceting on the reverse side of the stone, so it looks like a stone within a stone. It is available in 4 sizes and in a range of colors. The Swarovski Kaleidoscope Square Fancy Stone is made of "Advanced Crystal" and is lead free.