Blue sapphire engagement rings have been known to be preferred by royalty because the blue sapphire stone is even more rare than a diamond and is almost as hard. This is a nice factoid to share with your number one queen as you slip a blue sapphire engagement ring on her ring finger. Blue sapphires come in a range of shades from a light to deep blue. The blue color is due to the level of titanium in the stone: the more titanium, the richer the color. However, too much color can actually create a dull black effect, reducing the price of the stone.

Most blue sapphires are found in Sri Lanka, Burma, and Madagascar. Burmese sapphires tend to cost more than those from Sri Lanka and Madagascar due to their brilliant color. Kashmir blue sapphires are the most rare and expensive of all as the supply found in a remote region of India was exhausted around a 100 years ago, thus escalating price and demand.

Prices for blue sapphires depend on whether or not they’ve been treated (with untreated costing much more) as well as color, cut, tone (lightness or darkness of stone), saturation (degree to which hue is hidden by other shades), and clarity. One carat blue sapphires can range from a few hundred dollars to several thousand.