Things To Look For In A Sapphire Engagement Ring It is essential to take into account the 4 Cs— color , cut, clarity , and carat weight— when purchasing a gemstone. The most prized aspect of blue sapphire, however , is its color . Let's learn more about the four Cs. Color When one talks about sapphires, we instantly think of a beautiful blue stone. After all, the natural blue hue is the most noticeable aspect of this gemstone. The quality of sapphire will increase as it gets closer to a true blue hue, which also increases its price accordingly . Moreover , the hues of blue sapphire can vary from bright blue to a darker shade of blue that has a tinge of green and purple. But keep in mind that the sapphire loses value as the optical intensity of green and purple traces increases. Tone and saturation are two elements that might influence the color of a sapphire stone. Tone defines the sapphire's blue hue's lightness or darkness. A sapphire may seem washed out and less alluring in a lighter tone, whereas