What does diamond mean?
A diamond is a precious gemstone composed of pure carbon arranged in a crystal lattice, making it the hardest naturally occurring substance known. Prized for centuries for its brilliance, durability, and rarity, it is most famously set in engagement rings and other fine jewelry, where it symbolizes enduring love and commitment. Beyond its geological sense, the word extends to geometry, describing a rhombus or lozenge shape, and to games, naming both one of the four suits in a deck of cards and the infield of a baseball diamond. Figuratively, calling someone a 'diamond in the rough' suggests hidden excellence waiting to be polished, while a 'rough diamond' implies genuine worth beneath an unpolished exterior. With connotations of clarity, permanence, and exceptional value, diamond remains one of English's richest symbols for anything rare and precious.
A precious stone consisting of a clear, colorless crystalline form of pure carbon; the hardest natural substance.
"The museum displayed an enormous uncut diamond from South Africa."
Also used for industrial-grade diamond used in cutting tools, not just gem-quality stones.
A rhombus shape; specifically, one of the four suits in a standard deck of playing cards, marked by red lozenge symbols.
"She won the trick with her last remaining diamond."
The infield area of a baseball or softball field, so called for its square shape rotated forty-five degrees.
"The shortstop covered nearly the entire diamond in that play."
Figuratively, a person or thing of exceptional quality or value.
"Beneath his gruff manner was a real diamond of a man."
Regular plural formation; often used to refer collectively to multiple stones or, metonymously, to jewelry containing them.
"The crown jewels glittered with hundreds of diamonds."
Diamonds are made of exactly the same stuff as pencil lead — carbon — yet one is the softest thing in your desk and the other is the hardest natural material on Earth.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of diamond
The word diamond comes from the Old French 'diamant', which derived from the medieval Latin 'diamas', itself adapted from the Greek 'adamas', meaning unconquerable or invincible — the same root that gives us 'adamant' and 'adamantine'. The Greek term originally referred to any extremely hard metal or stone before becoming specifically associated with the gemstone. English adopted the word from French in the medieval period, reflecting the long history of diamond trade routes passing through Europe.
Related word forms
How diamond is actually used
As a figurative term, 'diamond' carries strongly positive connotations of rarity, purity, and enduring value. 'Rough diamond' describes someone with good character but unrefined manners. The card-suit sense is always capitalized informally only when referring to the suit name itself is not required; lowercase 'diamonds' is standard.
Easily confused with diamond
A carat is the unit of weight used to measure diamonds and other gemstones, not a type of stone itself.