Who made world’s largest single crystal sapphire tube?

Saint-Gobain produces the world’s largest single crystal Sapphire tube (2.5” outer diameter x 30” Long). For use in tube anneal furnaces for likes of metallurgy and high-temperature annealing. Sapphire can withstand temperatures, pressures and vacuum far greater than any other ceramic material while still allowing for visual observation of processes and experiments. The single crystal as-grown surfaces are transparent, nonporous and chemically inert making it ideal for use in high purity and particulate-free environments.

Sapphire is one of the two gem-varieties of corundum, the other being ruby (defined as corundum in a shade of red). Although blue is the best-known sapphire color, they occur in other colors, including gray and black, and they can be colorless. A pinkish orange variety of sapphire is called padparadscha.

Every sapphire mine produces a wide range of quality, and origin is not a guarantee of quality. For sapphire, Kashmir receives the highest premium, although Burma, Sri Lanka, and Madagascar also produce large quantities of fine quality gems.

The cost of natural sapphires varies depending on their color, clarity, size, cut, and overall quality. Sapphires that are completely untreated are worth far more than those that have been treated. Geographical origin also has a major impact on price. For most gems of one carat or more, an independent report from a respected laboratory such as GIA, Lotus Gemology, or SSEF, is often required by buyers before they will make a purchase.

Picture Credit : Google

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