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GemColour/VarietyPossible enhancementsGemstone care
AmberAll coloursHeating treatment to improve colour and clarity.Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
ApatiteNone.Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
BerylHeliodorIrradiated to improve colour.Basic jewellery care.
Aquamarine, MorganiteHeating treatment to improve colour and clarity.Basic jewellery care.
EmeraldInfused with colourless substances to improve surface uniformity.Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
ChalcedonyBloodstone, Blue Lace Agate, Chrysocolla, Chrysoprase, Jasper, Sardonyx, WhiteNone.Basic jewellery care.
Black, Blue and GreenDyed.Basic jewellery care.
Agate, CarnelianHeating treatment to improve colour.Basic jewellery care.
CharoiteCoated with colourless substances to improve surface uniformity and durability.Do not use ultrasonic cleaning.
ChrysoberylAlexandrite, Brown, Cat’s Eye, Cat’s Eye Alexandrite, Green, YellowNone.Basic jewellery care.
CorundumRuby, Star RubyHeating treatment to improve colour and clarity. Infused with colourless substances to improve colour and clarity.Basic jewellery care.
Blue Sapphire, Iridescent, Colourless, Green, Orange, Yellow,  Padparadscha, Pink, Violet Sapphires and Star SapphireHeating treatment and/or irradiation to improve colour and clarity. Infused with colourless substances to improve colour and clarity.Basic jewellery care.
DiamondNone.Basic jewellery care.
FeldsparLabradorite, Moonstone, Spectrolite, SunstoneNone.Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
AmazoniteCoated with colourless substances to improve surface uniformity.
FluoriteHeating treatment to improve colour.Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
GarnetAlmandite, Colour Change, Andradite, Grossular, Hessonite, Malaya, Pyrope, Rhodolite, Spessartite, TsavoriteNone.Avoid sudden temperature changes.
IoliteNone.Do not use ultrasonic cleaning.
JadeBlack, White Jadeite, Green and Lavender, Black and Green NephriteCoated with colourless substances to improve surface uniformity.Do not use ultrasonic cleaning.
KyaniteBlueNone.Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Lapis LazuliCoated with colourless substances to improve surface uniformity and durability.Do not use ultrasonic cleaning. Avoid contact with cosmetics, hairspray, perfume or household chemicals.
MalachiteCoated with colourless substances to improve surface uniformity and durability.Do not use ultrasonic cleaning. Avoid contact with cosmetics, hairspray, perfume or household chemicals.
OpalBlack, Blue, Boulder, Cachalong, Chrysopal, Crystal, Fire, Opalite, Pink, Prase, White, YellowCoated with colourless substances to improve surface uniformity and durability.Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Cultured PearlsSaltwater: Akoya, Mabe (assembled)Bleached and dyed to improve uniformity of colour.Have strands cleaned and re-strung annually if worn regularly. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Keshi, South Sea Golden, South Sea White, TahitianBleached and dyed to improve uniformity of colour. Covered to protect the natural organic material.Have strands cleaned and re-strung annually if worn regularly. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
FreshwaterBleached and dyed to improve uniformity of colour.Have strands cleaned and re-strung annually if worn regularly. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Natural PearlsFreshwater, SaltwaterBleached and dyed to improve uniformity of colour.Have strands cleaned and re-strung annually if worn regularly. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Calcareous ConcretionsConch, Melo MeloPolished to improve finish.Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
PeridotNone.Avoid contact with cosmetics, hairspray, perfume or household chemicals. Avoid contact with chlorate water.
PreniteCoated with colourless substances to improve surface uniformity.Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
QuartzAventurine, Dumortierite, Pietersite, Quartzite, Rock Crystal, Rose, Rutilated, Tiger’s Eye, Tiger’s Iron, TourmalinatedNone.Basic jewellery care.
Amethyst, Citrine, Prasiolite, SmokeyHeating treatment to improve colour.Basic jewellery care.
RhodochrositeCoated with colourless substances to improve surface uniformity.Do not use ultrasonic cleaning.
RhodoniteCoated with colourless substances to improve surface uniformity.Do not use ultrasonic cleaning.
ShellMother of PearlDyed.Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
SodaliteCoated with colourless substances to improve surface uniformity and durability.Do not use ultrasonic cleaning. Avoid contact with cosmetics, hairspray, perfume or household chemicals.
SpinelAll coloursNone.Basic jewellery care.
SpodumeneKunziteHeating treatment and/or irradiation to improve colour.Do not use ultrasonic cleaning. Avoid direct sunlight.
SugiliteCoated with colourless substances to improve surface uniformity.Do not use ultrasonic cleaning. Avoid contact with household chemicals.
TopazImperial, Orange, Pink, YellowHeating treatment and/or irradiation to improve colour.Basic jewellery care.
TourmalineChromeNone.Do not use ultrasonic cleaning. Avoid sudden temperature changes.
Blue, Green, Indicolite, Paraiba, YellowHeating treatment to improve colour and clarity.Do not use ultrasonic cleaning. Avoid sudden temperature changes.
Multicoloured, Pink, Purple, Rubellite, WatermelonIrradiated to improve colour.Do not use ultrasonic cleaning. Avoid sudden temperature changes.
TurcheseCoated with colourless substances to improve surface uniformity and durability.Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
UnakiteCoated with colourless substances to improve surface uniformity.Basic jewellery care.
ZirconAll coloursHeating treatment to improve colour.Do not use ultrasonic cleaning.
ZoisiteTanzaniteCoated with colourless substances to improve surface uniformity.Do not use ultrasonic cleaning. Avoid sudden temperature changes.
Ruby in ZoisiteCoated with colourless substances to improve surface uniformity.Do not use ultrasonic cleaning.
ThuliteCoated with colourless substances to improve surface uniformity.Do not use ultrasonic cleaning.