Color: Colorless, yellow, brown, orange, red, violet, blue, green
Hardness: 6.5 - 7.5 Mohs
Specific Gravity: 3.90 - 4.71
Refractive Index: 1.777 - 1.987
Records shown that Zircon has been used as gemstone since the beginning of history. Carved zircons have been recovered from some of the most ancient archaeological sites. Because of its high refractive index and strong dispersion, it has great brilliance and intense fire. It is brittle and therefore sensitive to knocks and pressure.
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This is a Blue Zircon from Thailand. The primary sources for zircon are Cambodia and Thailand, where it is found as waterworn pebbles colored reddish-brown to yellowish-brown. The pebbles are heated in primitive coal-burning ovens, sometimes several times. The treatment causes a color change, producing blue, golden-yellow, and colorless material. Bangkok is a cutting and heating center for zircon. Low-type zircon of gem quality is found in Sri Lanka, as worn pebbles in the gem gravels. (Source: Gems and Jewelry, Joel Arem, 1975). #bluezircon #pebbles #heattreatment #thailand #cambodia #gemsandjewelry #gemscutting #chiangmai #shirazjewelry
Deposits and Mines
Deposits are mostly found in Cambodia, Burma, Thailand and Sri Lanka. Bangkok is the cutting and heating center for zircon.
Naturally most zircon are gray-brown and red-brown. Heat treatment changes to colorless and blue Zircon. Occasionally red or orange stones appear on the market, but these colors are natural and not produced by heating.
What can you do with it?
Anything from ring, pendant, earring, and bracelet will look beautiful with zircon. The refraction index of zircon is very high. If cut as round brilliants, zircons have steely brilliance and dispersive color. These stone can easily be mistaken for diamonds at first glance. However, zircon is very brittle and susceptible to damage when worn in a ring. Small zircon may be used as side stones in jewelry, in place of diamond chips.