[header] How to buy sapphire [title] Know what tone of blue you want. [step] Sapphires come in blues, with the lightest being sweden princess blue and the darkest being navy or black. The most prized color is royal blue, which is in the middle of the scale. 
As the most prized, however, it is also the most expensive. Camelot and commodore blues, which are one shade lighter and darker, respectively, are similar in hue but slightly more affordable.