Ross-Simons - 1.00ct t. w. Diamond Eternity Circle Pendant Necklace Over Sterling. 18". Sleek and always stylish, this eternity circle pendant necklace is such a classic look - bright with 1.00 ct. t. w. round and baguette diamonds in a seamless, sparkling loop. Set in polished 18kt yellow gold over sterling silver and stationed on a cable chain. Springring clasp, diamond eternity circle pendant necklace. Diamond birthstones are the perfect gift for April birthdays.