Dead Colour: A term for colours used in under painting.

Deckle Edge: The ragged edge found on handmade papers.

Decoupage: The act of cutting out paper designs and applying them to a surface to make an all over collage.

Designer Colours: Best quality Gouache paints, often used in commercial art.

Diluents: Liquids, such as turpentine, used to dilute oil paint; the diluent for water based media is water.

Diptych: A pair of paintings or carvings on two panels hinged together so that they can be opened or closed.

Distemper: A non-permanent paint made by mixing colours with eggs or glue instead of oil.

Dispersion: Applied to paint, a smooth, homogeneous mixture of ingredients; the process of dispersal, in which pigment particles are evenly distributed throughout the vehicle.

Drier: A material that accelerates or initiates the drying of an oil paint or oil by promoting oxidation.

Drying Oil: An oil that, when spread into a thin layer and exposed to air, absorbs oxygen and converts into a tough film.

Diamond: The hardest known natural mineral to man.  Diamonds are the birthstone of April and the traditional gift for the 10th, 60th and 75th wedding anniversaries.  Learn more by visiting our Diamond Guide.

Diamond Clarity: One of the 4Cs that measures the amount/absence of inclusions in and blemishes on a diamond.  Clarity ranges from flawless to included/imperfect.

Diamond Color: One of the 4Cs that measures the amount of body color (tint) in a diamond on a scale from colorless to yellow/brown or gray.

Diamond Council of America (DCA): A not-for-profit organization that educates its students about diamonds, training them to become certified Diamontologists.

Diamond Cut: One of the 4Cs that determines how light travels through a stone.  Cut refers to the proportions of a stone, facet angles, finish and shape.

Diamond Total Weight: The sum of the carat weights for all diamonds in a piece of jewelry.

Diamond-Cut Finish: Created by cutting the metal with a diamond, giving it a glittering and sparkling look.