Over the past 45 years, Ted Themelis and his company, Gemlab Inc., have remained committed to serving the gemstone industry, representing a heritage of innovation, technology, experience, and trust. The company designs and fabricates world-class, unique gemstone treatment furnaces and related equipment with more than 100 installations worldwide; other activities include gemstone research and development, mining exploration, and diversified gemstone treatment projects focusing on the heat treatment of ruby and sapphire. These activities resulted in building an extensive database focused on the heat treatment of ruby-sapphire, published in the form of monographs written by Ted Themelis.