In the 18th century, George Spencer, the 4th Duke of Marlborough, amassed an incredible collection of carved gemstones and cameos. The Marlborough Collection was considered one of the best private jewelry collections and many of the 800 pieces of jewelry date back to antiquity. The collection was broken up in the 19th century to pay … Continue reading This 2,000-Year-Old Sapphire Ring Has an Incredibly Detailed Portrait Carved Into It