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GIA Colored Gemstones - Synthetic Gemstone Processes(questions and answers).
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GIA Colored Gemstones - Synthetic Gemstone Processes(questions and answers).
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GIA ColoredGemstones - Synthetic
Gemstone
Processes(questions
and answers)
Solution process - answer A growth method in
which the synthetic crystal grows from a dissolved
chemical mixture, sometimes at high temperature
and pressure.
- 2 most common: flux growth and hydrothermal
growth
- high cost, low volume
(Colored Stones: Assignment 5)
Flux Growth - answer A process in which nutrients
dissolve in heated chemicals, then cool to form
synthetic crystals.
- flux is a material that, when melted, dissolves
other materials
- requires metal crucible, preferably platinum
, - can take up to a year for crystal growth
- late 1930's - Chatham began marketing flux-
grown synthetic emerald
- usually begins with a seed crystal, or could result
from spontaneous nucleation
(Colored Stones: Assignment 5)
Hydrothermal growth - answer A process in which
nutrients dissolve in a water solution at high
temperature and pressure, then cool to form
synthetic crystals.
- method uses an autoclave filled with crushed
chemical compounds
- only method used to produce synthetic quartz***
- hydrothermal quartz appeared in 1890's
- hydrothermal emerald appeared in 1960
(Colored Stones: Assignment 5)
Melt process - answer A synthetic-crystal growth
method in which the chemical mixture is melted,
then recrystallized.
- 2 most common: flame fusion and pulling
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