Rare Double-Trapiche Emerald
At the AGTA show, Equatorian Imports showed this contributor two pieces of emerald with a very rare double-trapiche pattern. They weighed about 1.77 ct each, and according to the dealer they are from Muzo, Columbia. Instead of a six-ray star, twelve arms radiated from the center of the stone (figure 1). There was no core at the center. The twelve-ray star appeared to be composed of two six-ray stars shifted slightly from each other. All the rays had a dendritic appearance, with some of them intertwined. Unlike previously reported trapiches, these two specimens displayed at least three growth sectors. The formation of this double-trapiche pattern was most unusual.