Ruby

One is to note, that natural ruby is generally applied only in jewel production because of its high price. Artificial ruby is of a great importance for industry. Crystals for lasers and clock stones are made out of ruby. Natural ruby can also be used for clock stones, as it can be useless for the jewel job due to its small size (around 2 mm in diameter).
Subtle schemes for semiconductors are drawn with ruby needles. In the textile and chemical industries, ruby thread carriers pull strands of synthetic fibers.

Ruby

Formula for Ruby

Al2O3:Cr
Formula for Ruby

Properties for Ruby

Molar mass: 200.7869 g/mol
Melting point: 2050°C
Boiling point: 2980°C
Density: 3.9 – 4.1 g/cm3