black diamond: meaning, definition, pronunciation and examples
Low frequency (B2-C1 vocabulary). The compound is known, but not an everyday word for most speakers.Predominantly technical (geology, mining, gemmology) and specialist (skiing/sports). Used metaphorically in business/finance journalism. Less common in casual conversation.
Quick answer
What does “black diamond” mean?
A type of diamond, opaque and black in colour due to graphite inclusions.
Audio
Pronunciation
Definition
Meaning and Definition
A type of diamond, opaque and black in colour due to graphite inclusions; often industrial but also used in jewellery.
A challenging, expert-level ski slope marked with a black symbol; also used metaphorically for a difficult, dangerous, or high-stakes situation or asset. In economics, a resource whose value has not yet been realized.
Dialectal Variation
British vs American Usage
Differences
In skiing contexts, 'black diamond' (US) = 'black run' (UK). The UK more commonly uses 'black run'. The term 'black diamond' for the ski slope is American in origin and is understood but less used in the UK.
Connotations
In both: Gem = rare, edgy luxury. Skiing = danger, expertise. In US skiing, the term is standard and iconic.
Frequency
Higher frequency in US English due to its use in ski resort signage and marketing. In UK English, the gemological term is primary.
Grammar
How to Use “black diamond” in a Sentence
[The/This] + black diamond + [is/was/verb] + [adjective/noun phrase]He + [verb: skied/tackled/attempted] + the + black diamondTo + [verb: invest in/consider] + [something] + a black diamond + [opportunity/asset]Vocabulary
Collocations
Examples
Examples of “black diamond” in a Sentence
verb
American English
- We decided to black-diamond that trail after the new snow made it more challenging. (Informal, rare, verbing of the noun)
adjective
British English
- She bought a stunning black-diamond necklace. (Compound adjective)
American English
- He's a black-diamond skier, always seeking the hardest runs. (Compound adjective)
Usage
Meaning in Context
Business
Metaphor for an undervalued or high-risk, high-reward market, company, or investment. 'The company is seen as a black diamond in the rough tech sector.'
Academic
Used in geology, materials science, and gemmology papers to describe the specific mineral. 'The study analysed the formation of natural black diamonds.'
Everyday
Most likely in conversations about skiing holidays or, less commonly, when discussing unusual jewellery. 'I'm not good enough to try the black diamond yet.'
Technical
Precise classification in gemology (e.g., fancy black diamond). Classification of ski trail difficulty. Use as an abrasive material in industry.
Vocabulary
Synonyms of “black diamond”
Strong
Neutral
Weak
Vocabulary
Antonyms of “black diamond”
Watch out
Common Mistakes When Using “black diamond”
- Using 'black diamond' to mean any dark gemstone (e.g., onyx, black sapphire). Confusing it with 'blood diamond'. Using it as a simple adjective (e.g., 'a black-diamond car' is non-standard).
FAQ
Frequently Asked Questions
Yes, it is a polycrystalline diamond consisting of diamond, graphite, and amorphous carbon. Its black colour comes from numerous dark inclusions.
No, it is strongly advised against. Black diamond runs are for expert skiers and snowboarders only, featuring steep gradients, moguls, and potentially hazardous obstacles.
In North American ski resort trail rating systems, a double black diamond is even more difficult and dangerous than a single black diamond, often involving extreme terrain, cliffs, or requiring mandatory air.
It's a metaphor. Like the gem, a 'black diamond' business or market is valuable but hard to access, refine, or understand (the 'black' implying obscurity or difficulty), offering high returns for those who can master it.
A type of diamond, opaque and black in colour due to graphite inclusions.
Black diamond is usually predominantly technical (geology, mining, gemmology) and specialist (skiing/sports). used metaphorically in business/finance journalism. less common in casual conversation. in register.
Black diamond: in British English it is pronounced /ˌblæk ˈdaɪ.mənd/, and in American English it is pronounced /ˌblæk ˈdaɪ.mənd/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “A black diamond opportunity (a high-risk, high-reward venture)”
- “To be someone's black diamond (to be their most challenging but prized possession or project).”
Learning
Memory Aids
Mnemonic
Imagine a shiny, black piece of coal that is actually a super-hard, valuable diamond. Or picture a black diamond-shaped sign at the top of a terrifyingly steep ski slope.
Conceptual Metaphor
VALUABLE RESOURCES ARE DIAMONDS; DIFFICULTY/EXCLUSIVITY IS DARKNESS. A challenging but prized thing is a dark, unpolished gem.
Practice
Quiz
In which context would 'black diamond' most likely refer to an investment opportunity?