diamond

/ˈdaɪ(ə)mənd/

/ˈdaɪəmənd/

Other forms: diamonds

A diamond is a valuable gemstone that's often used to make expensive jewelry. You might admire your friend's diamond earrings, but secretly wonder if they're real.

An engagement ring is typically set with one or more diamonds. Diamonds used for jewelry are cut and polished, and they're evaluated for quality and price by weight, or carat, as well as by their cut, clarity, and color. Another kind of diamond is the geometrical shape, which is also seen on playing cards called diamonds, and echoed in the shape of a baseball field, also known as a diamond.

Definitions of diamond

1. noun

   very hard native crystalline carbon valued as a gem
   synonyms: adamant

   types:

   black diamond, carbonado

   an inferior dark diamond used in industry for drilling and polishing

   type of:

   C, atomic number 6, carbon

   an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds

   transparent gem

   a gemstone having the property of transmitting light without serious diffusion
2. noun

   a transparent piece of diamond that has been cut and polished and is valued as a precious gem
   types:

   ice, sparkler

   diamonds

   type of:

   gem, jewel, precious stone

   a precious or semiprecious stone incorporated into a piece of jewelry
3. noun

   a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
   synonyms: lozenge, rhomb, rhombus

   type of:

   parallelogram

   a quadrilateral whose opposite sides are both parallel and equal in length
4. noun

   a playing card in the minor suit that has one or more red rhombuses on it
   “he led a small diamond”

   “diamonds were trumps”

   type of:

   playing card

   one of a pack of cards that are used to play card games
5. noun

   the area of a baseball field that is enclosed by 3 bases and home plate
   synonyms: baseball diamond, infield

   type of:

   parcel, parcel of land, piece of ground, piece of land, tract

   an extended area of land
6. noun

   the baseball playing field
   synonyms: ball field, baseball field

   type of:

   athletic field, field, playing area, playing field

   a piece of land prepared for playing a game