GEM
ORO
The Sparkle Experts
18
PRELIMINARY GUIDELINE FOR GEMSTONE CLEANING
GEMSTONE
TOUGHNESS
STEAM
ULTRASONIC
Alexandrite
excellent
usually
usually
Amazonite
poor
never
never
Amber
poor
never
never
Amethyst
good
risky
usually
Aquamarine
good
usually
usually
Citrine
good
risky
usually
Coral
fair
risky
risky
Diamond
good
usually
usually
Emerald
poor
never
never
Garnet
fair
never
usually
Iolite
fair
risky
risky
Lapis Lazuli
fair
never
risky
Opal
fair
never
never
Pearl
good
never
never
Peridot
fair
never
risky
Ruby
excellent
usually
usually
Sapphire
excellent
usually
usually
Spinel
good
usually
usually
Tanzanite
fair
never
never
Topaz
poor
never
never
Tourmaline
fair
risky
risky
Turquoise
fair
never
never
Variscite
fair
never
never
Zircon
fair
risky
risky