limpid.
A diamond is said to be limpid when it is without body color and very transparent.
—The Book of Diamonds, by Joan Dickinson, 1965.
luster.
The appearance of a materials surface in reflected light; if it reflects the reflected light it has luster. The luster of rough diamond is said to be greasy; of fashioned diamonds, adamantine, from the Greek word for inconquerable.
—The Book of Diamonds, by Joan Dickinson, 1965.
mauve diamond.
This has enough purple in it to rate as a fancy.
—The Book of Diamonds, by Joan Dickinson, 1965.
milky diamond.
A diamond with a hazy interior.
—The Book of Diamonds, by Joan Dickinson, 1965.
orange diamond.
A diamond of distinct orange tint but also probably a diamond from the Orange River area in South-West Africa where most of these bright and sometimes flaming fancies are found.
—The Book of Diamonds, by Joan Dickinson, 1965.
philosophers stone.
An imagined, long searched for, never discovered stone which was believed by medieval alchemists to have the power to change rock or flint into gold or diamond.
—The Book of Diamonds, by Joan Dickinson, 1965.
phosphorescence.
The property of continuing to emit visible light in darkness after exposure to radiation. Some diamonds (like many squid) do it, but they are unusual diamonds.
—The Book of Diamonds, by Joan Dickinson, 1965.
photoluminescence.
The property of some diamonds and other gems to become luminescent when exposed to the action of visible or ultraviolet-light rays only. They are said to be fluorescent if luminescent during exposure, and photophorescent if luminescent or glowing afterwards.
—The Book of Diamonds, by Joan Dickinson, 1965.
pink diamond.
A light-red diamond, more reddish than peach colored, less rosy than rose colored, and less purle than heliotrope. A fancy.
—The Book of Diamonds, by Joan Dickinson, 1965.
premier diamond.
A diamond that changes color from blue to yellow depending on whether the light is daylight or incandescent light.
—The Book of Diamonds, by Joan Dickinson, 1965.