1 diamond | Definition of diamond

diamond

noun, often attributive
di·​a·​mond | \ ˈdī-(ə-)mənd How to pronounce diamond (audio) \

Definition of diamond

 (Entry 1 of 4)

1a : native crystalline carbon that is the hardest known mineral, that is usually nearly colorless, that when transparent and free from flaws is highly valued as a precious stone, and that is used industrially especially as an abrasive also : a piece of this substance
b : crystallized carbon produced artificially
2 : something that resembles a diamond (as in brilliance, value, or fine quality)
3 : a square or rhombus-shaped figure usually oriented with the long diagonal vertical
4a : a playing card marked with a stylized figure of a red diamond
b diamonds plural in form but singular or plural in construction : the suit comprising cards marked with diamonds
5 : a baseball infield also : the entire playing field

diamond

verb
diamonded; diamonding; diamonds

Definition of diamond (Entry 2 of 4)

transitive verb

: to adorn with or as if with diamonds

diamond

adjective

Definition of diamond (Entry 3 of 4)

: of, relating to, or being a 60th or 75th anniversary or its celebration diamond jubilee

Diamond

biographical name
Di·​a·​mond | \ ˈdī-(ə-)mənd How to pronounce Diamond (audio) \

Definition of Diamond (Entry 4 of 4)

Peter A(rthur) 1940–     American economist

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Did You Know?

The largest uncut diamond ever found on earth was the 3,106-carat Cullinan diamond. It was mined in South Africa in 1905 and cut to form the 530-carat “Star of Africa,” which is now part of the British Crown Jewels. But that is nothing compared with the biggest in the known universe. In 2004 American astronomers discovered a diamond 2,500 miles (4,000 km) wide, weighing 10 billion trillion trillion carats, at the heart of a white dwarf star eight light years away in the constellation Centaurus. The star is unofficially known as Lucy, after the Beatles song “Lucy in the Sky with Diamonds.”

Examples of diamond in a Sentence

Noun

a necklace studded with diamonds and rubies The ruby was surrounded by a ring of diamond. The children cut the fabric into diamonds. one heart, two diamonds, and two clubs He played the queen of diamonds.

Adjective

the celebration of Queen Victoria's diamond jubilee in 1897
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Recent Examples on the Web: Noun

The location is hardly secret, since the CST’s logo, two interlocking circles with diamonds, can be seen in aerial photos, carved into the high desert scrub, ostensibly to help guide Hubbard’s spirit back to its new body—whenever that happens. Matt Farwell, The New Republic, "Jeffrey Epstein Chose New Mexico for a Reason," 15 Aug. 2019 Apparently, there's now a new twist on the classic shape, looking a little more modern with an oval center stone and spiky pronged diamonds surrounding it. Katherine J. Igoe, Marie Claire, "A Replica of Kate Middleton's Engagement Ring Is Now Available for Less Than $35," 2 Aug. 2019 Nor did a Piaget watch with 227 white diamonds splashed across the face and wrist band. Washington Post, "Mexico auctions seized jewelry to fund road building," 29 July 2019 The 64-year-old with faux diamonds in his two front teeth is like a padrino, a godfather of the corridor. Los Angeles Times, "In the Piñata District, a street food market is a theater that overwhelms the senses," 18 July 2019 Not gold plated, it's made of real gold and embellished with diamonds. Jon Porter, The Verge, "Redmi India has turned its affordably priced phone into real gold," 17 July 2019 Well, the never-ending quest to optimize the All-Star Game always ends up with a few diamonds buried too deep in the grass. Gabe Lacques, USA TODAY, "Xander Bogaerts, Max Muncy among the biggest MLB All-Star Game snubs," 26 June 2019 At the tip, the electrodrill had a hollow, circular cutting bit studded with diamonds that rotated at a rate of 225 revolutions per minute. Jon Gertner, WIRED, "The Top Secret Cold War Project That Pulled Climate Science From the Ice," 12 June 2019 Rolex Oyster Perpetual Datejust 31 The olive green face, 18-karat yellow gold hands and sunray dial make for an eye-catching addition to the Rolex Datejust range—but the best detail is at 6 o’clock, where the VI numeral is set with 11 diamonds. Alexander Fisher, WSJ, "Baselworld Report: Our 10 Favorite Watches," 26 Mar. 2019

Recent Examples on the Web: Verb

Instead, they were drawn to the idea that diamonds represent authenticity. Andrew E. Kramer, New York Times, "A Diamond Giant Plays Up Its Russian Ties to Appeal to Americans," 11 July 2018 The Del Paso Youth Baseball league has not used the Johnston Park diamonds in two years, according to a staff report. Anita Chabria, sacbee, "Sacramento homeless: Tent city proposed for Johnston Park in north Sacramento | The Sacramento Bee," 24 Apr. 2017 They are accused of burglarizing Tustin Village Jewelers, Diamonds Direct in Laguna Hills, Nick’s Jewelry and Watch Craft in Fullerton and Mimi’s Jewelry and Ballard and Ballard Jewelry in Fountain Valley. Orange County Register, "Man gets 2 years for 5 Orange County jewelry store burglaries," 20 Jan. 2017

Recent Examples on the Web: Adjective

Diamond experts say the gem could be the 10th-largest ever discovered and initially pegged its value at $50 million. Alpha Kamara, USA TODAY, "Sierra Leone mystery: What is whopping 709-carat diamond worth?," 4 July 2017 Diamond’s facility in the county is Pump Station #1 in San Diego, where large-scale waterfalls help dilute the wastewater entering the treatment plant. Kristina Davis, sandiegouniontribune.com, "San Marcos company admits illegally dumping wastewater from portable toilets," 3 June 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'diamond.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of diamond

Noun

14th century, in the meaning defined at sense 1a

Verb

1751, in the meaning defined above

Adjective

1872, in the meaning defined above

History and Etymology for diamond

Noun

Middle English diamaunde, from Middle French diamand, from Late Latin diamant-, diamas, alteration of Latin adamant-, adamas hardest metal, diamond, from Greek

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More Definitions for diamond

diamond

noun

English Language Learners Definition of diamond

 (Entry 1 of 2)

: a very hard usually colorless stone that is a form of carbon and is used especially in jewelry
: a shape that is formed by four equal straight lines and that has two opposite angles that are smaller than a right angle and two opposite angles that are larger than a right angle
: a playing card that is marked with a red diamond shape

diamond

adjective

English Language Learners Definition of diamond (Entry 2 of 2)

: of or relating to the 60th or 75th anniversary of an important event (such as a marriage)

diamond

noun
di·​a·​mond | \ ˈdī-ə-mənd