(rail transport) superimposed pair of railway crossovers, resembling a letter X, permitting to travel in either direction between a pair of parallel tracks

A memorable mobile phone number.

A type of hard colourless topaz (not actual diamond as such).

(rail transport) An at-grade junction between two crossing railroad tracks.

(rail transport) An at-grade junction between two crossing railroad tracks.

An uncut diamond. / (figuratively) A person whose goodness or other positive qualities are hidden by a harsh or unremarkable surface appearance.

A four-cornered part of a baseball field in which the corners are the three bases and the home plate.

plural of diamond cutter

Used other than figuratively or idiomatically: see diamond, ring. / By extension, an engagement ring, usually one given by a man to a woman.

A diamond that has been mined in a war zone and sold in order to finance the conflict. / A diamond that has been illegally mined by criminals and sold on the black market.