The Ellipsoid Marquis is similar to Ellipsoid in that the outside is a square profile ellipse, while the inner surface is one continuous elliptical curve.  The resulting intersection of these two shapes is stunning, and it also makes for a comfortable ring.  This one holds a Marquis Cut stone. The ring shown has the inner curve in a polished finish and the outer surface in a brushed finish for contrast.  The stone shown is 5 x 10mm. Check the Special Styles section for a Companion ring for Ellipsoid.