Royal blue Aquamarine Cornflower sapphire 99.999% Al2O3 Paraiba

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Corundum, the name originated in India, the mineralogy name, the hardness is second only to diamond, we are familiar with ruby, sapphire are gem-grade corundum. The color of corundum gemstones is very rich, including almost all colors in the visible light spectrum of red, orange, yellow, green, blue, purple. This is because corundum belongs to other color minerals, colorless when pure, when it contains trace elements can cause color, different trace elements lead to different colors, of which chromium mainly leads to red, and the combined action of iron and titanium elements leads to blue.

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According to the Chinese national standard GB/T16553-2017 "Jewelry Jade Identification", corundum gems are divided into ruby and sapphire two kinds according to color. Ruby, the red corundum gemstone, including red, orange, purple, maroon; Sapphire refers to all corundum gems except rubies, including blue, blue-green, green, yellow, orange, pink, purple, gray, black, colorless and other colors. So sapphire is not necessarily blue!

Color has the greatest influence on the value of a sapphire. Royal blue describes a sapphire with a pure blue to very light purple-blue hue, with vivid saturation, which in rare cases can range from strong to deep, and the hue should be medium to medium dark. For more information on color classification. Look here.

Clarity has a very important effect on the value of a sapphire. Royal blue sapphires must be flawless, preferably with clean eyes, or at least transparent, with no obvious inclusions, and very visible under the table. The uniformity of color must be excellent or even.

The cut plays a very important role in the color of the sapphire. Royal blue sapphires should have excellent to good proportions to maximize total internal reflection. Royal blue sapphires should not appear with significant Windows (transparent areas) and/or extinction when viewed from the front.

Treatment of royal sapphires is accepted only without treatment or conventional heating. Therefore, any other treatment, such as diffusion of foreign ions into the sapphire lattice, such as beryllium or titanium, fracture sealing with resin or lead, cobalt and/or silicate glass, will not be awarded a gemological report and therefore does not meet the requirements for Royal Blue or any other color classification