When mentioned about sapphire, blue is the all-time favourite color and the most classic choice. As color is the most important determinant, saturated hues that are neither too light nor too dark being the most valuable.
Royal Blue Sapphire is medium dark blue color in tone. Gems that have little or no gray or brown modifier are described as vivid. Royal Blue Sapphire with vivid saturation considered most valuable. Royal Blue Sapphire from Sri Lanka still considered most valuable compared to royal blue sapphire from rest of the world.
Sapphire over 2 carats are rare and prices tend to increase exponentially with carat weight. Any high quality blue sapphire over 5 carats would be regarded as very rare and collectible.
"Sharing is caring", by Ivy Teong, Chief Designer, Juwelen Design. She is also the author for juwelendesign.blogspot.my or ivyteong.blogspot.com