synthetic ruby

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• Ruby — This article is about the mineral. For other uses, see Ruby (disambiguation). Ruby Natural ruby crystals from Winza, Tanzania General Category …   Wikipedia

• ruby — rubylike, adj. /rooh bee/, n., pl. rubies, adj. n. 1. a red variety of corundum, used as a gem. 2. something made of this stone or one of its imitations, as a bearing in a watch. 3. a deep red port wine. 4. deep red; carmine. 5. Brit. Print. a… …   Universalium

• Ruby — /rooh bee/, n. a female given name. * * * Gemstone composed of transparent red corundum. Its colour varies from deep to pale red, in some cases with a tinge of purple, depending on chromium and iron content; the most valued is a pigeon blood red …   Universalium

• Ruby laser — A ruby laser is a solid state laser that uses a synthetic ruby crystal as its gain medium. It was the first type of laser invented, and was first operated by Theodore H. Ted Maiman [Maiman, T.H. (1960) Stimulated Optical Radiation in Ruby .… …   Wikipedia

• Synthetic alexandrite — is a crystal which has been created by the floating zone method. This method is also used to synthetically grow a variety of crystals: YAG (Yttrium Aluminum Garnet) in white, blue, pink and several other shades, ruby, chrysoberyl and, most and… …   Wikipedia

• ruby spinel — Mineral. a deep red, transparent variety of spinel, used as a gem. Also called spinel ruby. [1830 40] * * * ▪ mineral       natural or synthetic gem quality spinel (q.v.; magnesium aluminum oxide) that resembles ruby. The two natural gems are… …   Universalium

• Sapphire — For other uses, see Sapphire (disambiguation). Sapphire The 423 carat (85 g) blue Logan sapphire General Category Oxide mineral …   Wikipedia

• laser — /lay zeuhr/, n. Physics. a device that produces a nearly parallel, nearly monochromatic, and coherent beam of light by exciting atoms to a higher energy level and causing them to radiate their energy in phase. Also called optical maser. [1955 60; …   Universalium

• Transparent alumina — is a transparent form of aluminium oxide, Al2O3. In bulk, solid form, alumina is a colorless, transparent solid. Rubies and sapphires are two forms, containing different impurities, which occur naturally. Rubies and sapphires can also be… …   Wikipedia

• Mechanical watch — The movement of a Russian watch A mechanical watch is a watch that uses a mechanical mechanism to measure the passage of time, as opposed to modern quartz watches which function electronically. It is driven by a spring (called a mainspring) which …   Wikipedia

• crystal — crystallike, adj. /kris tl/, n., adj., v., crystaled, crystaling or (esp. Brit.) crystalled, crystalling. n. 1. a clear, transparent mineral or glass resembling ice. 2. the transparent form of crystallized quartz. 3. Chem., Mineral. a solid body… …   Universalium