We did zircon heat-treatment article before with traditional oxidising method. You can see that, We were able to get good yellow color from dark brownish purple zircon.
In this time, We did oxireducing by using traditional method. That heating method has been using in Sri Lanka for 1000 years. Old businessmens say, their grand fathers taught them how do that and thats grand fathers also had learned from their old generation.
This time, We used oily green zircons for oxireducing by traditional system. We had experiences with heating oily green zircons to get sky blue color.
We did oxidising in atmosphere at zircon Heat-treatment part (i). but, We need to make some mixture to cover stones before Heating to do oxireducing process. We used CaCO3 powder and rice to make traditional mixture.
That covered Zircon balls are kept on Coconut shell Carbon-burner and slowly blowed by using pipe.
Right side stone was successfully turned to sky blue color. but, Left side stone was turned bit low color.
Zircon is a nesosilicates group mineral. Its corresponding chemical formula is ZrSiO4. The name derives from the Persian zargun, meaning “gold-hued”. Zircon is a popular gemstone that has been used for nearly 2000 years.
The crystal structure of zircon is a tetragonal crystal mineral with 7.5 hardness according to the Mohs Hardness scale. Zircon is also very resistant to heat and corrosion and known as Insoluble gemstone. This Uniaxial (+) mineral Specific gravity is 4.6–4.7. It’s heavy more than such as Sapphire, chrysoberyl, Garnets, spinels. Gem Businessmen use these physical properties to identify zircons from other gemstones.
Zircon has weak pleochroism and has colors such as Colorless, Very Strong Blue To Green-Blue, Yellow, Blue-Green, Yellowish Green, Yellow-Green, Brown, Orangy Yellow To Reddish Orange, Dark Brownish Red, Sometimes Purple, Gray To Bluish Gray, Brownish Gray. Colorless specimens that show gem quality are a popular substitute for diamond and are also known as “Matara diamond”. Zircon has been classified into three types called high zircon, intermediate zircon ( medium zircon ), and low zircon. Some Quality Type brown zircons can be transformed into colorless and blue zircons by heating to 800 to 1000 °C.
There are Some using names for Zircon such as Hyacinth or jacinth: yellow-red, orange, red-brown to brown, Jargoon or jargon: light yellow to colorless stones, Beccarite: green zircon, Melichrysos: straw yellow, Starlite: blue heat treated zircon, Sparklite: colorless zircon. Zircon is found in Madagascar, Sri Lanka, Tanzania, Cambodia, Australia, Burma, Afghanistan, Canada, USA, Thailand, Russia, Mozambique, Norway.
Healing Properties 👇
Zircon is known as “The stone of virtue” All colors. It clears the auric negativity in the wearer and helps to communicate with the higher realm when in need. Zircon is very well known for its balancing and positive energy effects. It can attract happiness, prosperity, and abundance to the wearer.
It will bring the spiritual energy down from the higher transpersonal chakras via the crown chakra, then move it to all of the lower chakras.
1 thought on “Zircon Heat Treatment Part (ii) – Traditional Oxireducing”
Thank you for the interesting video and document. I am a doctor doing gems as a hobby and science. You have not indicated the exact way of making the covering paste with CaCo3 and rice. Is it a secret or you can give the method?