People associate the Blue colour of this gemstone with feelings of sympathy and harmony, friendship and loyalty:
The Sapphire also know as "Saturn's Gemstone" is believed to be the strongest and the fastest acting gemstone among the nine planetary gemstones.
Thus the blue of the sapphire has become a colour which fits in with everything that is constant and reliable. May be that is one of the reasons why women in many countries wish for a sapphire ring on their engagement. The sapphire symbolises loyalty, but at the same time it gives expression to people's love and longing.