Model # 359053 open back w/o dia. sides blank up to 1/2 ct. Rings that appear two tone, that is with a gold shank and silver emblems are only available in gold or white gold metal choices. If you select sterling silver or gold plated sterling silver, the ring will typically be uniform in color. Exceptions to this can be made on a case by case basis but require you to contact us via email or phone and a surcharge may be required for the additional labor.