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Precious blue and light-blue sapphires
Natural sapphire belongs to the corundum mineral variety, which is distinguished by blue shades. Stones having a color other than blue and blue are classified as fantasy sapphires, for example, yellow, pink, purple, padparadja, green or colorless. The cost of sapphires of blue shades increases with the mass of the stone. This circumstance is due to the fact that large-sized crystals are extremely rarely mined.
The color palette of transparent blue sapphires varies widely. There are blue and blue tones of different saturation. There are instances of blue-violet or blue-green shades, but the most valuable and rare stones include samples of a uniform bright blue color.
The rarest and most expensive color variations of blue natural sapphires are:
Cornflower Blue - crystals of “cornflower blue” tone are distinguished by “silkiness” and the effect of weak internal luminescence. These properties are associated with the presence of rutile inclusions reflecting light rays. The landmark is the blue color of the cornflower flower, but for sapphires it is a whole range of colors from bright blue to bright blue, but not dark. It is important to note that for the Russian market the stones of precisely blue-velvet blue color are more suitable than the royal blue. The reason for this - a large number of cloudy days, as a result, sapphires "royal blue" in our strip can look dark and lose their charm, unlike in Asia, where they look very expensive and aristocratic.
Peacock blue - this bright blue color is found in sapphires from Sri Lanka, another name for this spectacular color is "electric blue". Not all world laboratories distinguish this color in a separate category, but on the market it has long been entrenched between cornflower blue and royal blue. This color looks very bright with any type and brightness of lighting.
Royal Blue is the most expensive variety of blue sapphires. Royal blue is a range of shades of rich, deep blue color, but not turning into black. The borders of this color range in different world laboratories are different, for example, in the GIT (Gemological Institute of Thailand) the set of Royal blue sapphire samples includes dark blue hues. As we wrote above, in Russia such samples of sapphires look dark, so you should only buy sapphires seeing the stone live. Sapphires of this color category are usually used in their collections jewelry houses Graff level.
Price of blue sapphire
The cost of natural sapphires of beautiful blue hues is increasing every year, and global demand is growing. It is impossible to give price statistics for top large (8-10 and 10 carat) blue sapphires of the Royal blue, Cornflower blue and Peacock blue color categories. Selling each such precious specimen is a complicated bidding process between the buyer and the dealer, often such transactions are of a closed format. The average prices for Ceylon blue non-refined sapphires of the highest gem quality in the weight category of 8-10 carats are determined by the world market at $ 5000–8000 per carat. Unique samples from Burma in the same weight category are significantly more expensive - $ 10000-18000 per carat. Such quality sapphires are rare.
Let us give a price range for the characteristics of blue sapphires that are more demanded by the market - this is an average mass of 3-5 carats with a different level of jewelry quality, but excluding the region of production:
Low (commercial) quality - in this category sapphires that have been diffused or heated. The colors are either light or too dark. There are inclusions. Price plug: $50-500 / carat.
Good quality - in this group blue sapphires after heat treatment or without, but light blue colors, the purity of such stones, as a rule, is not perfect. Price plug: $600-1600 / carat.
Very good quality - in this category blue sapphires of bright blue colors without ennobling or just warm but top hues. The purity of such samples is good, but there may be inclusions barely visible to the eye, located on the periphery of the stone. Price plug: $1700-3500 / carat.
Excellent quality - only non-refined stones of the most expensive color varieties (Royal blue, Cornflower blue and Peacock blue) are well cut and visually clean. Price plug: $3600-5000 US dollars per carat.
* Prices are averaged, do not take into account annual growth and are relevant for 2017-2018.