Charlie Ramsell, a digging buddy of Robert's,  mines for Aquamarine on Mt. Antero and Mt. White here in Colorado.  Charlie provided us with quite a few Aqua crystals and we faceted two of them into these matching 5mm round Aquamarine gemstones weighing .5 cts each.  We set them in 14kt Yellow Gold Post Earrings.
 
Aquamarine is a March Birthstone.