Ruby stone and sapphire belong to corundum family and the hardness of both sapphire and ruby stone is 9.0 which is quite hard. The color of ruby is red and the color of sapphire may ranges from pink, red, orange, yellow. The both sapphire and ruby are precious stones that look immensively good and use for jewelry items. There are few differences between sapphire and ruby which are highlighted in the following blog http://ruby.org.in/difference-between-ruby-gemstone-and-sapphire-stone/