- Beryl (Var: Aquamarine)
- Thumbnail, 2.0 x 0.7 x 0.6 cm
- Mt Antero, Chaffee Co., Colorado, USA
A superb, water-clear aquamarine thumbnail with excellent color from Mt. Antero, Colorado. Collected by the late Colorado field collector George Robertson, the piece was long in the collection of Colorado's top thumbnail collector, Ralph Clark, himself a world-class thumbnail collector.