Beyond a work of art: The Richard Mille RM 07-02 Automatic Sapphire collection
THE new Richard Mille RM 07-02 Automatic Sapphire collection combines the appeal of a clean design with the mechanical ...
Hackaday4y
A Quick And Easy Recipe For Synthetic Rubies
Like their gemstone cousin the sapphire, rubies are just a variety of corundum, or aluminum oxide. Where sapphire gets its blue tint mainly from iron, rubies get their pink to blood-red hue from ...