Bismuth crystals | If you want one of the rarest bismuth crystals in the world, here it is!!! It was amazing seeing this creation come forth from the molten bismuth. Simply massive in size at 566 grams, and 4 1/2” by 4 1/8” by 3”. It has gorgeous pastel colors of greens, pinks, oranges, yellows, purples, blues, browns and golds.