Solid Gold
14K recycled solid gold.
Solid gold all the way through, with no surface layer to wear away. These are the pieces most likely to outlive you, and the ones we would call heirlooms without hesitating.
Made from reclaimed gold rather than newly mined. Chemically identical, same purity, same 14K stamp, and a fraction of the environmental cost. A small collection, priced accordingly, and built to be kept.