Blue zircon

blue zircon

Gemstone Info

Gemstone Description


Blue zircon

Blue zircon is the most brightest blue stone for jewelry. It can be used for ring, necklace and earrings. It s a perfect gift as engagement ring set on white gold.

There is little gemstone varieties of blue color which combine both hardness and gloss. Sapphire is the most famous. Blue topaz is the most popular blue gemstones, the color comes from irradiation of colorless topaz, it is widely available at attractive prices and is found in light tones, also medium and dark. Other choices of gemstones, including tanzanite (blue-violet) and aquamarine (light blue). Tourmaline and spinel can be found in blue sometimes, but rarely.

The brightest blue gemstone

zircon is the gemstone of the brightest blue color, its refractive index is even higher than sapphire, tanzanite and spinel. But zircon is poorly understood by the general public, which is likely to be confused with cubic zirconia, an artificial stone simulated diamond. Zircon is a natural mineral, We can find zirconium silicate in all colors of the zircon, including colorless.

Blue zircon is the most popular color. Blue color is the result of heat treatment of brown zircon. But all brown zircons not become blue when heated, and only a few zircons with the right physical structure turn blue when heated. This is why most blue zircon comes from Cambodia.

Brown zircon turns to blue after heat treatment

Gemolocial description

Natural zircon is a mineral belonging to the group of nesosilicates. Its chemical name is zirconium silicate and its also corresponding chemical formula is ZrSiO4. A common empirical formula showing some of the range of substitution in zircon is (Zr1–y, REEy)(SiO4)1–x(OH)4x–y. Zircon forms in silicate melts with large proportions of high field strength incompatible elements. For example, hafnium is almost always present in quantities ranging from 1 to 4%. The crystal structure of zircon is tetragonal crystal system.

Zircon is ubiquitous in the crust of Earth. It occurs as a common accessory mineral in igneous rocks, as primary crystallization products, in metamorphic rocks and as detrital grains in sedimentary rocks. Large zircon crystals are rare. Their average size in granite rocks is about 0.1 to 0.3 mm, but they can also grow to sizes of several centimeters, especially in mafic pegmatites and carbonatites.

The color of zircon varies between colorless, also yellow-golden, red, brown, blue, and green.

Pailin’s diamond

Some gem traders calls “Matura diamond” the colorless specimens of zircon. Cambodian people also talk about “Pailin’s diamond”. Knowing that there is no diamond in Cambodia. Pailin is the name of a province in ouest Cambodia, border with Thailand.


The name derives from the Persian zargun meaning golden-colored. This word is also corrupted into “jargoon”, a term applied to light-colored zircons. The English word “zircon” comes from “Zirkon,” which is the German adaptation of this word.

Natural zircon from Ratanakiri, Cambodia

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