OMG, hockeyfan, that's terrific. It's a Tiffany "Atlas" ring. Here'as a similar one from Tiffany's Web site: . This one is "open" while yours is solid. The one in the picture is 18K and $1400.
1970 COMPASS-
WHITES SILVER EAGLE-
WHITES DFX, 4X6DD COIL, 6X8DD COIL, 950 COIL, 10X12SEF COIL-
GARRETT PRO POINTER AT, GARRETT AT PRO , MINELAB EXPLORER SE with 8.5x12.5 Cors coil