Size: 1.5mm, 2.0mm, 2.5mm 
Color: "Yellow" Sapphire
Cut: Round Brilliant
Ethical Source: Montana, USA by Columbia Gem House. 

Sapphire is next to diamond on the hardness scale. It is a beautiful and durable stone that comes in a wide variety of colours from red, yellow, green, and the traditional blue. Ruby is simply a specific colour of Sapphire.