Whois & Analysis for grind-techs.com

Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide with trace amounts of elements such as iron, titanium, cobalt, lead, chromium, vanadium, magnesium, boron, and silicon.

The name sapphire is derived via the Latin ' from the Greek sappheiros, which referred to lapis lazuli.

It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors.

Red corundum stones also occur, but are called rubies rather than sapphires.

Pink-colored corundum may be classified either as ruby or sapphire depending on locale.

Commonly, natural sapphires are cut and polished into gemstones and worn in jewelry.

They also may be created synthetically in laboratories for industrial or decorative purposes in large crystal boules.

Because of the remarkable hardness of sapphires 9 on the Mohs scale (the third hardest mineral, after diamond at 10 and moissanite at 9.5) sapphires are also used in some non-ornamental applications, such as infrared optical components, high-durability windows, wristwatch crystals and movement bearings, and very thin electronic wafers, which are used as the insulating substrates of special-purpose solid-state electronics such as integrated circuits and GaN-based blue LEDs.

Sapphire is the birthstone for September and the gem of the 45th anniversary.

A sapphire jubilee occurs after 65 years.

A ceramic is any of the various hard, brittle, heat-resistant, and corrosion-resistant materials made by shaping and then firing an inorganic, nonmetallic material, such as clay, at a high temperature.

Common examples are earthenware, porcelain, and brick.

A ruby is a pinkish red to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide).

Ruby is one of the most popular traditional jewelry gems and is very durable.

Other varieties of gem-quality corundum are called sapphires.

Ruby is one of the traditional cardinal gems, alongside amethyst, sapphire, emerald, and diamond.

The word ruby comes from ruber, Latin for red.

The color of a ruby is due to the element chromium.

The ampere (symbol: A), often shortened to amp, is the unit of electric current in the International System of Units (SI).

One ampere is equal to 1 coulomb (C) moving past a point in 1 second.

It is named after French mathematician and physicist André-Marie Ampère (1775–1836), considered the father of electromagnetism along with Danish physicist Hans Christian Ørsted.

A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.

A simple lens consists of a single piece of transparent material, while a consists of several simple lenses (elements), usually arranged along a common axis.

Lenses are made from materials such as glass or plastic and are ground, polished, or molded to the required shape.

A lens can focus light to form an image, unlike a prism, which refracts light without focusing.

Devices that similarly focus or disperse waves and radiation other than visible light are also called "lenses", such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses.