Sterling Lind Co. ring

Sterling Lindbergh corporation ring. This beautiful sterling silver ring stamped Sterling Lind, passed all the tests that a real diamond ring would pass e.g.: sinking at the bottom of a cup using cold water, emitting a blue-colored glow under UV light, etc…but when I took it to the jeweler, he confirmed that it was a high quality cubic zirconia, not moissanite. Size 7.