Coal vs. Diamond — What's the Difference?

Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.

Diamond is a form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. At room temperature and pressure, another solid form of carbon known as graphite is the chemically stable form of carbon, but diamond almost never converts to it.

A combustible black or dark brown rock consisting chiefly of carbonized plant matter, found mainly in underground seams and used as fuel

A precious stone consisting of a clear and colourless crystalline form of pure carbon, the hardest naturally occurring substance

Provide with a supply of coal

A figure with four straight sides of equal length forming two opposite acute angles and two opposite obtuse angles; a rhombus

A natural dark brown to black graphitelike material used as a fuel, formed from fossilized plants and consisting of amorphous carbon with various organic and some inorganic compounds.

An extremely hard, highly refractive crystalline form of carbon that is usually colorless and is used as a gemstone and in abrasives, cutting tools, and other applications.

A piece of this substance.

A piece of jewelry containing such a gemstone.

A glowing or charred piece of solid fuel.

A rhombus, particularly when oriented so that one diagonal extends from left to right and the other diagonal extends from top to bottom.

Charcoal.

A red, lozenge-shaped figure on certain playing cards.

To burn (a combustible solid) to a charcoal residue.

A playing card with this figure.

To provide with coal.

Diamonds (used with a sing. or pl. verb) The suit of cards represented by this figure.

To take on coal.

The infield.

(uncountable) A black or brownish black rock formed from prehistoric plant remains, composed largely of carbon and burned as a fuel.

The whole playing field.

(countable) A type of coal, such as bituminous, anthracite, or lignite, and grades and varieties thereof, as a fuel commodity ready to buy and burn.

Of or relating to a 60th or 75th anniversary.

(countable) A piece of coal used for burning this use is less common in American English

To adorn with diamonds.

(countable) A glowing or charred piece of coal, wood, or other solid fuel.

(uncountable) A glimmering glass-like mineral that is an allotrope of carbon in which each atom is surrounded by four others in the form of a tetrahedron. Category:en:Carbon

Charcoal.

A gemstone made from this mineral.

(intransitive) To take on a supply of coal (usually of steam ships).

A ring containing a diamond.

(transitive) To supply with coal.

A very pale blue color.

(intransitive) To be converted to charcoal.

Something that resembles a diamond.

(transitive) To burn to charcoal; to char.

(geometry) A rhombus, especially when oriented so that its longer axis is vertical.

(transitive) To mark or delineate with charcoal.

(geometry) The polyiamond made up of two triangles.

A thoroughly charred, and extinguished or still ignited, fragment from wood or other combustible substance; charcoal.

(baseball) The entire field of play used in the game.

A black, or brownish black, solid, combustible substance, dug from beds or veins in the earth to be used for fuel, and consisting, like charcoal, mainly of carbon, but more compact, and often affording, when heated, a large amount of volatile matter.

(baseball) The infield of a baseball field.

To burn to charcoal; to char.

(card games) A card of the diamonds suit.

To mark or delineate with charcoal.

A size of type, standardised as 2 point.

To supply with coal; as, to coal a steamer.

The size of type between brilliant and pearl, standardized as 2-point.

To take in coal; as, the steamer coaled at Southampton.

Made of, or containing diamond, a diamond or diamonds.

Fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period

Of, relating to, or being a sixtieth anniversary.

A hot glowing or smouldering fragment of wood or coal left from a fire

Of, relating to, or being a seventy-fifth anniversary.

Burn to charcoal;

(slang) First-rate; excellent.

Supply with coal

To adorn with or as if with diamonds

Take in coal;

A precious stone or gem excelling in brilliancy and beautiful play of prismatic colors, and remarkable for extreme hardness.

A geometrical figure, consisting of four equal straight lines, and having two of the interior angles acute and two obtuse; a rhombus; a lozenge.

One of a suit of playing cards, stamped with the figure of a diamond.

A pointed projection, like a four-sided pyramid, used for ornament in lines or groups.

The infield; the square space, 90 feet on a side, having the bases at its angles.

The smallest kind of type in English printing, except that called brilliant, which is seldom seen.

Resembling a diamond; made of, or abounding in, diamonds; as, a diamond chain; a diamond field.

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

Very hard native crystalline carbon valued as a gem

A playing card in the minor suit of diamonds

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

The baseball playing field