Won worldwide popularity tourmalines are blue and green hues. Blue tourmalines are known as indigolite (in most of the samples meet greenish hues), and tourmaline green tones – verdelite. Instances containing impurities of chromium, referred to as fromtermini. A remarkable number of characteristics contributes to the wide popularity of all tourmalines and indigolites including: high hardness, magnificent luster and affordable prices.
Integrity are rare minerals and are very much appreciated. It is important to note that the blue tourmalines are much less of rubellite (pink to red tourmalines) and verdelite. Meet the blue tourmalines in a variety of tones ranging from bright blue-green and ending with a rich dark blue. In the global Gemological community, there are periodic disputes about chargeability of rocks to the category of indigolite. Most often, discussing the admissibility of a certain number of green shades in the samples. Visually clean tourmaline bright blue color with a minimum of greenery or no greenery are the most rare, their cost is comparable with the cost Paraiba tourmalines. The cost of the copies is determined by their color and purity. Tourmaline bright blue color are less common and are much more expensive than the common gems of green and yellowish hues.
Prices indigolite are formed depending on the brightness and saturation of minerals and their size. Cheap gems are $50-100 per carat, they may contain inclusions, their weight usually does not exceed 2-3 carats and is characterized by not very expressive painting. The best and largest specimens of saturated blue colors can cost upwards of $1000-1500 for one carat. These blue tourmaline gem, the demand for them is growing every year, resulting in higher cost.