diamond · noun /ˈdɑɪ.mənd/Full view
diamond (STONE)
B2 C or U an extremely hard valuable stone which is used in jewelry, and in industry for cutting hard things
Dictionary examples:

a diamond ring/necklace

He had worked in the diamond mines of South Africa.

Learner example:

She found a gorgeous diamond ring on her finger. (First Certificate in English; B2; Japanese)

diamond (SHAPE)
B2 C a shape with four straight sides of equal length, forming two opposite angles which are wide and two which are narrow
Dictionary example:

Joe's socks had diamond patterns on them.

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