On a Roll
Natural-sided pink tourmaline, ends polished, with green tourmaline, center, carved by the artist, with treated onyx beads and silver toggle clasp, 18” long.
The wheel and axle were a great step forward, and they are still with us today.
Most treated black onyx is actually simmered in sugar syrup for a week. A bath in sulfuric acid turns it black.
Source of tourmaline rough: Minas Gerais State, Brazil.