Synthetic star rubies and sapphires were manufactured by the Linde Air

Precious gemstones

Heinz-Jürgen BERNHARDT, Phd

Gem Profile: Corundum, Wire-Sculpture.com

Dual-Color Double Stars in Ruby, Sapphire, and Quartz: Cause and

Microscopy of the diamond surfaces shows polishing relics

Synthetic Star Ruby with an Unusual Production History. - Document

Signed Linde Blue Star Sapphire 9x7mm Oval Synthetic Star Sapphire

Synthetic star rubies and sapphires were manufactured by the Linde

PDF) Gem-Quality Haüyne from the Eifel District, Germany

Carl A. Francis's research works Harvard University, MA (Harvard