Antique Twin Diamond Ring and Band Set. Unique and unusual. A beautiful and sparkling Toi et Moi , or yin and yang, twin diamond ring, with a fitted wedding band, handcrafted in France during the first decade of the last century. A pair of bright-white old mine-cut diamonds sit across from each other between a sinuous S curve paved with small twinkling rose cut diamonds. An elegant ring for an alternate engagement style.