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2. Hexagonal crystal family - Wikipedia

   en.wikipedia.org/wiki/Hexagonal_crystal_family

   Hexagonal crystal family. In the hexagonal family, the crystal is conventionally described by a right rhombic prism unit cell with two equal axes ( a by a ), an included angle of 120° ( γ) and a height ( c, which can be different from a) perpendicular to the two base axes. The hexagonal unit cell for the rhombohedral Bravais lattice is the R ...

3. Transparent ceramics - Wikipedia

   en.wikipedia.org/wiki/Transparent_ceramics

   Synthetic sapphire – single-crystal aluminum oxide (sapphire – Al 2 O 3) is a transparent ceramic. Transparent ceramics have recently acquired a high degree of interest and notoriety. Basic applications include lasers and cutting tools, transparent armor windows, night vision devices (NVD), and nose cones for heat seeking missiles.

4. Millennium Sapphire - Wikipedia

   en.wikipedia.org/wiki/Millennium_Sapphire

   Rather than cut it into smaller pieces, Daniel Mckinney, one of the owners of the gem, sought to use the whole stone and kept it as one crystal to pay tribute to humanity. In 2003 the Guinness World Records was awarded to The Millennium Sapphire as The World’s Largest Engraved Sapphire at 61,500-carats. Today, it is still regarded as the ...

5. AOL

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   AOL is a leading online service provider that offers free email, news, entertainment, and more. With AOL, you can access your email from any device, customize your inbox, and enjoy a secure and reliable email experience. Sign in to AOL today and discover the benefits of AOL Mail.

6. Verneuil method - Wikipedia

   en.wikipedia.org/wiki/Verneuil_method

   Verneuil method. The Verneuil method (or Verneuil process or Verneuil technique ), also called flame fusion, was the first commercially successful method of manufacturing synthetic gemstones, developed in the late 1883 [1] by the French chemist Auguste Verneuil. It is primarily used to produce the ruby, sapphire and padparadscha varieties of ...

7. Asterism (gemology) - Wikipedia

   en.wikipedia.org/wiki/Asterism_(gemology)

   A purple-pink star sapphire displaying asterism in a platinum ring. An asterism (from Ancient Greek ἀστήρ (astḗr) 'star', and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone. It can appear when a suitable stone is cut en cabochon (i.e. shaped and polished, not faceted ). A gemstone that exhibits this ...