Check out this newly added 14kt Solid Yellow Gold Slide. Custom made to fit 3.00 ct to 4.00 ct round brilliant Diamond. (Not included)
Omega necklace that would best fit would have dimensions .5 mm to 1.8 mm diameter.
Worn with a leather necklace as shown in the picture this piece is extremely adjustable from to 41 inches long to 20 inches the shortest.