The Chalk Emerald is a world-renowned, 37.82-carat Colombian emerald, famous for its deep green color, exceptional clarity, and regal history, once part of a Maharani's necklace in India before being donated by the Chalk family to the Smithsonian, where it's displayed alongside the Hope Diamond at the National Museum of Natural History. Key Characteristics: Weight & Cut: 37.82 carats, rectangular step-cut. Color: Highly prized velvety deep green, characteristic of Muzo, Colombia emeralds. Clarity: Superb, making it one of the finest Colombian emeralds. Setting: Set in a platinum ring with 60 surrounding diamonds, designed by Harry Winston, Inc.. History & Provenance: Origin: Mined near Muzo, Colombia, a famed source of high-quality emeralds. Indian Royalty: Legend says it was the centerpiece of a necklace for a Maharani of Baroda, India, in the 16th-17th centuries.