Karat is karat: the gold deposited in plating carries the same elemental composition as solid gold of the same designation.
A Storied Heritage
The love knot originated in Celtic interlace, Roman wool ties, and sailor's rope work. Each tradition manipulated material into forms that couldn't be easily undone as a demonstration of a permanent bond. The jewelry expressed that logic in precious metal.
Care & Keeping
If a replacement clutch back is ever needed for post earrings you've gifted, it's an easy ask at any jewelry counter. Fine jewelry posts run to a consistent gauge, so matching the metal and specifying standard or comfort-back size is all it takes to fit virtually any post.