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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:510-236-2313
Fax: 510-236-2332
mary@medacreations.com
www.medacreations.com
Copyright 2005 MED’A Creations |