Dichroite: See Iolite.
Dinner ring: Another name for a Cocktail ring.
Diopside: A crystallized silicate of lime and magnesia found in igneous rocks which ranges in color from clear, grayish green to almost black.
Dichroite
Another name for Iolite, a transparent dichroic gemstone
Dichroscope
An instrument used to view the different colors of a dichroic mineral or determine is a gemstone is dichroic.
Also known as Dichroite and Cordierite
Color: Most commonly blue, but can be violet, brown, or green
Hardness: 7 to 7.5
Transparency: Transparent, translucent ...
aka Cordierite, Dichroite, Spanish Lazulite, Vikings' Compass, Water Sapphire
The name iolite comes from the Greek ios ("violet").
Alternate names include dichroite and cordierite. Iolite crystallizes in the orthorhombic system and is highly pleochroic. Changes in color, or intensity of color can be seen when the stone is rotated and viewed at different angles.
Dichroite and Cordierite are it's additional names. It is the gem variety of the mineral cordierite. It is the 21st anniversary gemstone. This gemstone is gaining fame with each passing day due to its splendid colour and moderate pricing.
Iolite is known as Canadian Sapphire, Water Sapphire, Corierite, and Dichroite. Iolite is found in India, Sri Lanka and Connecticut within the U.S. The name Iolite is derived from this gems magnificent violet color.
Iolite: (also called dichroite or water sapphire). A silicate of alumina, iron, and magnesia which is usually violet-blue, but can be deep blue, light blue-gray, and yellow-white.
(also called dichroite or water sapphire). A silicate of alumina, iron, and magnesia which is usually violet-blue, but can be deep blue, light blue-gray, and yellow-white. Makes a beautiful transparent gemstone which is remarkable for its dichroism.
Cordierite is also known as iolite and dichroite. Other common names are water sapphire and Vikings' compass, named so because of it's ability to determine the direction of the sun on overcast days.
Also called "water sapphire", iolite has a dichroite effect, meaning, when it is looked at from different directions, it shows different colors according to the light passed through it.
Iolite: Transparent, deep blue to yellowish-gray, also called dichroite or cordierite, similar in color to sapphire but not as hard, iolite is relatively new to jewelry. Composition: magnesium aluminum silicate; hardness 7.3. Search Iolite ...
It is also called by others names such as Cordierite from the French mineralogist Pierre Louis Antoine Cordier; another is Dichroite from the Greek word meaning « two colored », because of the strong pleochroism of iolite.
One of the names comes from the Greek "ion", meaning "violet", while the name cordierite comes from the French geologist, Pierre Louis Cordier. Another common name is "dichroite" from its strong dichroic nature. Insoluble in acids.
Gem info: ...
dichroite
Ison glass...see mica
Jadeite
Crystallography: monoclinic
Colors: green, white, brown, mauve, black orange red, yellow
Luster: waxy
Hardness: 6.5 - 7
Specific gravity: 3.33 v. .04 ...
 See also: Color, Stone, Gemstone, Iolite, Sapphire
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