Timeless and Elegant. Our Classic Solitaires with Matching Bands are available with different cuts and sizes of center stones and metal options. The shank of the Solitaire measures approximately 2.75 mm wide and the Matching Band measures approximately 2.5 mm wide. Shanks also available in wider widths (3mm and 4mm) via special order. An additional matching band also available via special order for the stacking or wider look. The 14K White Gold and Yellow Gold sets come standard with a White Gold Head. The 18K White Gold and 18K Yellow Gold sets come standard with a Platinum Head.