Sapphire, the birthstone of September is the traditional anniversary gift for 5th, 10th, 23rd and 45th year of marriage. Blue sapphire is the most iconic of all the natural sapphire colors. But, even in blue, sapphires occur in a number of shades. Ideally, a buyer must gain familiarity with the hue, tone and saturation of blue sapphires. The color of a sapphire depends on these three factors, and even though they seem like the same thing, they are not. So, if you are planning to buy a sapphire, take a minute to go through the rest of the article to understand the concept of color in sapphire.
Hue as in Color
Color is the same as hue. So, the hue of sapphire is the shade of blue it wears. A sapphire that has a true blue hue is the most expensive of all. However, there are other less expensive shades too that range from green to purple, each carrying a distinct shade of blue. The closer a stone is to the real blue hue, the more valuable it is. The bluest sapphires are the most desirable of all, in blue sapphires. They are also scarcer than the other less expensive shades.
Tone or Darkness
Tone in gem colors refers to the lightness or darkness of the hue. So, the tone of a blue sapphire is basically the lightness and darkness of its color. The safest range in blue sapphires is medium to dark where the stone is closest to real blue. If you are looking for a sapphire which has a high tone of blue, then pick from the Dark side of the color scale. Those who can do with medium darkness will find ample choices in the medium slot. To save a little expense, choose your stones from tones closer to Dark but not quite.
Saturation is the purity and intensity of the color of a stone. In other words, the brightness of the color is referred to as the saturation. The stones with highest saturation have the brightest blue shades. So, if you are looking for stones that have the most intense blue color, you need to pick from the highest saturation products.
In short, a blue sapphire is at its best when it has a true blue color, a dark tone and a high saturation.