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

n very hard native crystalline carbon valued as a gem

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

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

ice, sparkler
Type of:
gem, jewel, precious stone
a precious or semiprecious stone incorporated into a piece of jewelry

n a parallelogram with four equal sides; an oblique-angled equilateral parallelogram

rhomb, rhombus
Type of:
a quadrilateral whose opposite sides are both parallel and equal in length

n 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

n the area of a baseball field that is enclosed by 3 bases and home plate

baseball diamond, infield
the area of a baseball playing field beyond the lines connecting the bases
Type of:
parcel, parcel of land, piece of ground, piece of land, tract
an extended area of land

n the baseball playing field

ball field, baseball field
Type of:
athletic field, field, playing area, playing field
a piece of land prepared for playing a game

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