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level: Stability

Questions and Answers List

Question	Answer
Which factors can affect the stability of a gemstone?	Light
Stability factors can be exploited to alter what in terms of gem materials?	Appearance
What aspect of jadeite can be improved by exposing the minerals within the stone to acid?	Colour
What can happen to an opal if it is exposed to heat or light for a long period of time, causing it to break?	Dehydration
What can happen to the colour of an amethyst if it is exposed to heat or light for long periods of time?	Fade
What can happen to amber if it is exposed to heat, for instance during setting or repair?	Melt
Which stone should not be cleaned in an ultrasonic cleaner or exposed to high heat, as this can cause removal of fillers used to treat the stone?	Emerald
What optical aspect of a pearl can be greatly affected by exposure to everyday chemicals such as perfumes or household detergents?	Lustre