The most valuable color of the sapphire is a cornflower blue color, known as Kashmir sapphire. Other color sapphires are yellow, orange, pink etc which are sourced from regions like Madagascar, Thailand, Nigeria, Srilanka, Australia.
When the trace elements are iron and titanium, the sapphire is blue and the more iron the sapphire contains, the darker the blue. Chromium can cause the pink of pink sapphire.
Fine colored sapphire with a deep color and excellent transparency can reach several thousand dollars a carat.