Tiffany & Co. Elsa Peretti 18k Yellow Gold Tear Drop Bypass Ring Size 6. This ring is from Tiffany & Co. by designer Elsa Peretti from her TEARDROP collection. It is crafted from solid 18k yellow gold in a high polished finish and bares the designers name and metal content. Material: Solid 18k yellow gold. Hallmark: Tiffany & Co. 750 Elsa Peretti Spain Measurements: Front: It is 22mm across x 11mm wide x 5mm high Ring Size: 6 Weight: 15.5 grams Stock#: 30678