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Natural Gemstones You Can Fire-in-Place

There is always some risk when firing natural gemstones since each stone is unique. However, Eye Clean gemstones with no visible inclusions of the following types can usually be fired in place in PMC3 at 1110F.   Faceted stones in the Corundum family (sapphire & ruby) are the safest to fire-in-place as modern sapphires are heat treated prior to faceting. They can be heated up to 1650F for 2 hours.

Diamond (all colors)
Garnet (all types, may darken when fired)
Green Tourmaline
Hematite
Kyanite (rough, not faceting quality)
Moldavite
Moonstone (pink, gray, & white)
Peridot
Ruby (ok up to 1650F)
Sapphire (all colors ok up to 1650F)
Black Star Sapphire
Tanzanite
Topaz (white & green)
Tsavorite (green garnet)

 

Natural Gemstones You Can Set Afterward

The following natural gems are not recommended for firing in place as they will be damaged by the heat.  Those with an asterisk (*) may survive firing at 1110F.

Adventurine Lapis (all types)*
Agate Malachite
Amber Rainbow Moonstone*
Amethyst Mother of Pearl
Aquamarine Opal
Carnelian Pearl
Chalcedony Quartz (all Colors:  e.g., Rose,
Chrisoberyl               lemmon, smoky)
Citrine Opaque Sapphire/Ruby
Coral & Shell Rhodochrosite
Emerald Serpentine
Flourite Tiger's Eye
Goldstone Topaz (blue, rainbow)
Iolite Multi-Tourmaline
Jade Pink Tourmaline
Jadeite Turquoise
Labradorite* Unakite

 

MED’A Creations
San Pablo, CA
Phone / Fax:510-236-2313
mary@medacreations.com
www.medacreations.com

Copyright 2005 MED’A Creations