4
GUIDELINE FOR GEMSTONE CLEANING
Gemstone
Durability
Steam
Ultrasonic
UV light
Agates
Moderate
Not Recommended* Not Recommended*
Yes
Alexandrite
Strong
Yes
Yes**
Yes
Amazonite
Moderate
Not Recommended* Not Recommended* Not Recommended*
Amber
Fragile
Not Recommended* Not Recommended* Not Recommended*
Amethyst
Moderate
Not Recommended* Yes**
Not Recommended*
Aquamarine
Strong
Yes**
Yes**
Yes
Carnelian
Moderate
Yes**
Yes**
Yes
Chalcedony
Moderate
Yes**
Yes**
Yes
Citrine
Moderate
Not Recommended* Yes**
Not Recommended*
Coral
Fragile
Not Recommended* Not Recommended* Yes***
Diamond
Strong
Yes
Yes
Yes
Diamond
Colored/Inclusion
Strong
Yes
Yes**
Yes
Emerald
Strong
Not Recommended* Not Recommended* Not Recommended*
Garnet
(Malaya/Rhodolite)
Moderate
Not Recommended* Yes**
Yes
Hematite
Moderate
Yes
Yes
Yes
Iolite
Moderate
Not Recommended* Not Recommended*
Yes
Jade
Moderate
Yes**
Yes**
Yes
Lapis Lazuli
Moderate
Not Recommended* Not Recommended*
Yes
Malachite
Fragile
Not Recommended* Not Recommended*
Yes
Marcasite
Moderate
Not Recommended* Not Recommended* Not Recommended*
Onyx
Moderate
Yes**
Yes**
Yes
Opal
Moderate
Not Recommended* Not Recommended* Yes***
Pearl
Fragile
Not Recommended* Not Recommended*
Yes
Peridot
Moderate
Not Recommended* Not Recommended*
Yes
Ruby
Strong
Yes
Yes**
Yes***
Sapphire
Strong
Yes
Yes**
Yes
Spinel
Strong
Yes
Yes**
Yes
Tanzanite
Moderate
Not Recommended* Not Recommended*
Yes
Topaz
Strong
Not Recommended* Not Recommended* Yes***
Tourmaline
Moderate
Not Recommended* Not Recommended*
Yes
Turquoise
Moderate
Not Recommended* Not Recommended*
Yes
Variscite
Fragile
Not Recommended* Not Recommended* Not Recommended*
Zircon
Moderate
Not Recommended* Not Recommended* Yes***
Information used in Guideline for Gemstone cleaning is based on Essential Colored Stone
Reference Guide from Gemological Institute of America (GIA).
