Ross-Simons - 40.00 ct. t. w. Sapphire Tennis Necklace in Sterling Silver. 18". Sapphires in sterling fit for royalty! A shining sterling silver setting displays 40.00 ct. t. w. oval sapphires, creating an all-around regal look. Drape yourself in this beautiful blue necklace for a statement that's sure to turn heads - and won't break the bank. Double-latch safety. Box clasp, sapphire tennis necklace. Sapphire birthstones are the perfect gift for September birthdays.