Robert has mined for Aquamarine on Mt. Antero near Buena Vista, Colorado, and has been faceting them over time, including this 4mm round gem which he added to this Size 6 ½ Sterling Silver Ring.  He also mined for Peridot on his own mining claim South of Hartsel, Colorado.  For contrast, he added two smaller 3mm round Peridot gems.  A very nice pastel color combination.