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 most expensive option is a field diamond Box ticket, which are the closest seats to the field. Kaylee Staral, Milwaukee Journal Sentinel, 8 Oct. 2021 The natural pearl and diamond necklace is an early 19th century style and the creation of the necklace has been attributed to Ntot, the founder of Chaumet. Beth Bernstein, Forbes, 8 Oct. 2021 One of the world’s oldest and largest hotel brands has just announced a collection of exclusive experiences to mark its diamond anniversary that run the gamut from a celebratory riff on the French 75 to a collection of fittingly glitzy global trips. Rachel Cormack, Robb Report, 6 Oct. 2021 The family of Israeli diamond trader Beny Steinmetz, for example, appears in the documents, with administrators discussing two foundations registered in Liechtenstein with about $1.2 billion in assets. Washington Post, 6 Oct. 2021 He was last seen wearing a navy polo shirt, black jeans, a white Chicago White Sox hat with a red brim, a diamond stud in his right ear, a silver watch on his left wrist, a metallic bracelet on his right arm and a gold chain necklace. Katherine Rosenberg-douglas, chicagotribune.com, 15 Sep. 2021 It is set in 14-karat gold with a total diamond weight of 1.75 carats. Carlos Monarrez, USA TODAY, 26 Sep. 2021 He was also photographed for a magazine cover using Merkel’s signature diamond hand gesture, made by resting the hands in front of the stomach and putting the thumbs and index fingers into a quadrangular shape. NBC News, 25 Sep. 2021 Milamore specializes in unique pearl and diamond jewelry. Kristen Shirley, Forbes, 24 Sep. 2021 Recent Examples on the Web: Verb Instead, they were drawn to the idea that diamonds represent authenticity. Andrew E. Kramer, New York Times, 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, 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, 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, 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, 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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Time Traveler for diamond

Time Traveler

The first known use of diamond was in the 14th century

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Dictionary Entries Near diamond

diammonium phosphate

diamond

Diamond

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Statistics for diamond

Last Updated

11 Oct 2021

Cite this Entry

“Diamond.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diamond. Accessed 15 Oct. 2021.

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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 3 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 How to pronounce diamond (audio) , ˈdī-mənd \

Kids Definition of diamond

1 : a very hard mineral that is a form of carbon, is usually nearly colorless, and is used especially in jewelry
2 : a flat figure ◊ like one of the surfaces of certain cut diamonds

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