Ross-Simons - 8.75ct t. w. Sapphire, 1.50ct t. w. Diamond Tennis Necklace. 18". Indulge in the luxury of sapphires and diamonds at an affordable price! This magnificent tennis necklace features 8.75 ct. t. w. round sapphires illuminated by 1.50 ct. t. w. round brilliant-cut diamonds in polished sterling silver. Graduates from 1/16" to 3/16" wide. Single-latch safety. Push-button clasp, diamond and sapphire tennis necklace. Diamond birthstones are the perfect gift for April birthdays.