The Diamond is Classic Swarovski, and has been for decades. A consistant best seller, this piece captures the sun's rays at any and every angle, its perfect facets creating one of the most stunning array of rainbows of any prism. The perfect symmetry makes it a favorite Feng Shui crystal. Love rainbows?? You gotta have this prism!! The 30mm is great, the 40mm more impressive, and the 50mm is just simply awesome. Available in 30mm (1.2"), 40mm (1.6") and 50mm (2").