This is a multi-faceted oval aquamarine colored glass stone set in a silver and marcasite setting.  The beauty of this ring is evident in the sparkling blue stone that looks like either a dark aquamarine or a light blue topaz.  The stone is nicely set in a bezel setting of good quality with beautiful detail in the setting.  The marcasites are all set with a bead setting, an old method where tiny beads are used as prongs to hold the stones in place.  The stone alone is 1/2" long and 3/8" wide.  The sterling setting is 3/4" tall by 9/16" wide.  Size 7.