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.
How much is a Blue Zircon?
From THB 300 (+/-US$ 12) per carat to THB 7,000 (+/-US$ 244) per carat. Top price per carat is virtually unlimited depending on the carat size, clarity, and color. Prices we mentioned are indication only based on what we have observed in the market in 2021.
How hard is Blue Zircon?
The hardness is 6.5 - 7.5 on the Mohs scale, however zircon is very brittle and should be handled and worn with great care. It is sensitive to pressures and knocks, and will show signs of wear along the facet edges. Stones in a parcel that are roll against each other may show damage on the facet edges.
Where to buy Blue Zircon?
Thailand, Cambodia, Myanmar and Australia are the sources for high quality gem-type zircons. Some other sources includes Sri Lanka and Malagasay Republic. Zircon itself is NOT a rare mineral, and occurs throughout the world. Bangkok is the cutting and heating center for zircon.
Is Blue Zircon burned/heated?
In short: Yes. Colorless zircons are naturally exist. Unless explicitly mentioned, most blue and colorless stones are the result of heat treatment.
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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
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.