Gemstone Treatment& Special Care Guide

GemstoneTreatment Method(s)Special Care Instructions
AbaloneabaloneSometimes dyed to improve color.Abalone is easily scratched. Wear with care. Abalone is porous. Avoid contact with colored fluids. Avoid extended exposure to bright lights. Avoid contact with harsh chemicals, acids, solvents and heat. Do not expose them to ultrasonic cleaning.
AmethystamethystOccasionally heated to improve color.Some untreated amethysts may fade in prolonged exposure to sunlight.
AquamarineaquamarineUsually heated to improve color. Occasionally fracture-filled to improve appearance.Avoid contact with harsh chemicals and heat. Do not expose them to ultrasonic cleaning.
Black Diamondblack-diamondMay be irradiated and/or heated to produce color. May be laser-drilled or fracture-filled to improve appearance.Avoid recutting, steam cleaning and ultrasonic cleaning.
Blue Topazblue-topazBrown topaz stones are irradiated and often heated to produce blue topaz.Avoid exposure to bright light.
Brown Diamondbrown-diamondMay be irradiated and/or heated to produce color. May be laser-drilled or fracture-filled to improve appearance.Avoid recutting, steam cleaning and ultrasonic cleaning.
CitrineCitrine is produced by heating different varieties of quartz.N/A
CrystalMay be surface-coated to enhance color or appearance.Avoid hard contact and abrasive surfaces. Keep away from cosmetics and household chemicals.
CZMay be surface-coated to enhance color or appearance.Avoid hard contact and abrasive surfaces. Keep away from cosmetics and household chemicals.
DiamondOccasionally laser-drilled or fracture filled to improve appearance. On rare occasions, diamonds may be surface-coated or heated with pressure to alter their color and/or clarity.Avoid recutting diamonds that have been fracture filled. For stones that have been surface-coated, avoid steam cleaning, ultrasonic cleaners, and alcohol. They may adversely affect the stones’ color and appearance.
DrusyMay be surface-coated to enhance color or appearance.Avoid recutting and repolishing. Avoid contact with abrasive surfaces.
EmeraldUsually fracture filled with oil, wax or resin to improve appearance. Occasionally dyed to improve color.Avoid sudden changes in temperature, ultrasonic cleaners, steam cleaners and chemicals.
GarnetSome varieties are heat-treated to improve color.Avoid sudden changes in temperature.
JadeOften bleached or dyed to improve the stone’s color. Also commonly fracture filled with wax to improve the stone’s appearance.Avoid heat, strong light, chemicals, and ultrasonic cleaners.
Lemon QuartzUsually heated to improve color.N/A
MarcasiteNot treatedAvoid acids and harsh chemicals.
MoissaniteMost Moissanite is untreated. However, Moissanite can be surface-coated to change the stone’s color.For surface-coated stones, avoid repolishing or recutting, steam cleaning, harsh chemicals and ultrasonic cleaners.
MorganiteCommonly heat-treated or irradiated to improve color and appearance.Avoid exposure to heat.
Mother of PearlSometimes dyed to improve color.Mother of Pearl is easily scratched. Wear with care. Mother of Pearl is porous. Avoid contact with colored fluids. Avoid extended exposure to bright lights. Avoid contact with harsh chemicals, acids, solvents and heat. Do not expose them to ultrasonic cleaning.
Mystic TopazSurface coated to change or improve color.Avoid repolishing or recutting, steam cleaning, harsh chemicals and ultrasonic cleaners.
OnyxDyed to improve colorAvoid prolonged exposure to bright light.
OpalImpregnated with colorless oil, wax, resin or plastic to improve appearance and durability.Avoid heat, chemicals, heat and ultrasonic cleaners.
PearlsWhite pearls are bleached to improve color and uniformity. Colored pearls are often dyed, and occasionally undergo irradiation to improve their colors.Avoid chemicals, cosmetics, and ultrasonic cleaners.
PeridotSometimes fracture filled with colorless oil, wax or resin to improve appearance.Avoid sudden changes in temperature, ultrasonic cleaners and harsh chemicals.
RubyUsually heat-treated, and occasionally lattice-diffused to improve or change color. Commonly fracture-filled to improve appearance. On rare occasion, stones may be dyed or irradiated.Avoid excess heat, harsh chemicals, prolonged exposure to light, and ultrasonic cleaners. Avoid repolishing or recutting when effect is near the surface.
SapphireUsually heat-treated, and occasionally lattice-diffused to improve or change color. Sapphires are also occasionally irradiated to produce a temporary yellow or orange color.Avoid excess heat, harsh chemicals, prolonged exposure to light, and ultrasonic cleaners. Avoid repolishing or recutting when effect is near the surface.
Smoky QuartzCommonly irradiated to enhance color.Avoid exposure to bright light.
TanzaniteHeated to produce its violet-blue color.Avoid sudden temperature changes and harsh abrasives.
Tiger-eyeMay undergo heat treatment or bleaching to improve color.Avoid prolonged exposure to bright light. Avoid harsh chemicals and heat. Do not expose them to ultrasonic cleaning.
TopazMay undergo heat treatment, surface treatment, irradiation, or lattice diffusion to improve or change the stone’s color.Avoid heat, exposure to bright light, repolishing or recutting, chemicals, and ultrasonic cleaners.
TourmalineMay be heated or irradiated to improve color. May be infused with colored oil, resin or dye to improve appearance.Avoid sudden temperature changes, steam cleaning, and ultrasonic cleaning.
TurquoiseImpregnated with colorless oil, wax, or plastic to improve appearance and durability. Sometimes dyed to improve color.Avoid hot water and household chemicals.

Normal Gemstone Care

With all gemstones, avoid rough handling when they are not being worn. Keep jewelry items separate to avoid scratches. Clean with warm, soapy water and gentle brushing.