Sapphire

Blue, will probably always be the most popular sapphire color, but purple, green, yellow, orange, padparadscha, and white are sometimes even more rare than the blue. 

Also dichroic and bi-color, even color change and star sapphires are also in high demand. Burmese, padparadscha, Kashmir, and Ceylon sapphires are among the most expensive. Royal and cornflower blue are the top colors of blue as far as pricing. True Kashmir sapphires are almost non-existent now since mining has ended and no new deposits found. 

Sapphires can be treated with (glass) or beryllium making them far, far less valuable. Any dyes or treatments other than heat are generally unacceptable in the fine gem trade. Unheated sapphires bring a premium price. 

10 products