Margaret De Patta "Ring" circa 1954 - Ms. De Patta was a founding member of the San Francisco Metal Arts Guild and one of the few American metalworking jewelers to present ideas evolving from the modern art movement of the time.
this time we can observe growth structure (trigons) on a very deep green chrome crystal of Tourmaline. 350 ct and about 44 x 40 mm specimen. They are very diamond like termination. to be remembered that Tourmaline has a trigonal symmetry. cosmic technology ?? amazing what nature does..so perfect! Addictive right?