The Chalk Emerald is a rectangular step-cut

emerald Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium or sometimes vanadium.Hurlbut, Cornelius S. Jr. and Kammerling, Robert C. (1991) ''Gemology'', John Wiley & Sons, New York, p ...

, mined in Muzo,

Colombia Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the ...

. It was one of many

Colombian emeralds Emeralds are green precious gemstones that are mined in various geological settings. They are minerals in the beryl group of silicates. For more than 4,000 years, emeralds have been among the most valuable of all jewels. Colombia, located in no ...

shipped to

Mughal India The Mughal Empire was an early-modern empire that controlled much of South Asia between the 16th and 19th centuries. Quote: "Although the first two Timurid emperors and many of their noblemen were recent migrants to the subcontinent, the d ...

by the Spanish in the 16th and 17th centuries. Ownership of the stone after its arrival is unrecorded until its sale by Jagaddipendra Narayan, the

Maharaja Mahārāja (; also spelled Maharajah, Maharaj) is a Sanskrit title for a "great ruler", "great king" or " high king". A few ruled states informally called empires, including ruler raja Sri Gupta, founder of the ancient Indian Gupta Empire, a ...

of Koch Bihar, to a British gem broker in 1959. Jagaddipendra stated that the stone was formerly the centerpiece of an emerald and

diamond Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Another solid form of carbon known as graphite is the chemically stable form of carbon at room temperature and pressure, b ...

necklace A necklace is an article of jewellery that is worn around the neck. Necklaces may have been one of the earliest types of adornment worn by humans. They often serve ceremonial, religious, magical, or funerary purposes and are also used as sym ...

worn by his mother,

Indira Devi Indira Devi, born as Indira Raje (19 February 1892 – 6 September 1968), was the Maharani of the princely state of Cooch Behar, British India. She was the daughter of Chimnabai II. She broke her arranged engagement to marry Jitendra Narayan ...

, to various state functions. The emerald was purchased by the American jeweler Harry Winston, who recut it from its original weight of , and added a

gold Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile ...

setting Setting may refer to: * A location (geography) where something is set * Set construction in theatrical scenery * Setting (narrative), the place and time in a work of narrative, especially fiction * Setting up to fail a manipulative technique to e ...

to attach it to a

platinum Platinum is a chemical element with the symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish , a diminutive of "silver". Pla ...

ring of his own design. Surrounding the Chalk Emerald itself are sixty pear-shaped diamonds, totalling . The ring was sold in 1962 to Oscar Roy Chalk—an entrepreneur from New York for whom the emerald is now named—for his wife Clair to wear to a state dinner at the

White House The White House is the official residence and workplace of the president of the United States. It is located at 1600 Pennsylvania Avenue NW in Washington, D.C., and has been the residence of every U.S. president since John Adams in ...

in honor of

Queen Elizabeth II Elizabeth II (Elizabeth Alexandra Mary; 21 April 1926 – 8 September 2022) was Queen of the United Kingdom and other Commonwealth realms from 6 February 1952 until her death in 2022. She was queen regnant of 32 sovereign states during ...

. Supposedly, she turned the ring around during the event so as to not upstage the less-impressive emerald ring worn by the Queen. The Chalks donated the ring to the

Smithsonian Institution The Smithsonian Institution ( ), or simply the Smithsonian, is a group of museums and education and research centers, the largest such complex in the world, created by the U.S. government "for the increase and diffusion of knowledge". Found ...

in 1972, and it is now part of the Smithsonian's National Gem and Mineral Collection on display in the

National Museum of Natural History The National Museum of Natural History is a natural history museum administered by the Smithsonian Institution, located on the National Mall in Washington, D.C., United States. It has free admission and is open 364 days a year. In 2021, with 7. ...

in Washington, D.C.Smithsonian Institution
Chalk Emerald
National Museum of Natural History website, retrieved December 29, 2022.

References

External links

{{Colombian emeralds Individual emeralds Colombian emeralds Individual rings Jewellery in the collection of the Smithsonian Institution Baroda State