This huge oval shaped ruby is natural.  This deep red ruby is set in a openwork, scrolled silver setting. This large oval ruby measures over 10 carats.

Ruby:  One oval shaped natural ruby measuring appx 10.37 carats, 12.65 x 13.11 x 5.20mm, Clarity: Opaque, visible natural inclusions, smooth surface, Color: Deep Red
Measures: H3/4" x W1/2", height above finger 3/8"
Size: 5.25
Weight: 6.2 Grams