Basic
Terms used in Gemology
Real
or Natural gemstones: Real or Natural Gems are those which are entirely the
product of nature and unaltered by humans in any way, except for ordinary
cutting and polishing.
Treated
gem: Any gem material which has been altered by humans, beyond ordinary cutting
or polishing. For example Diffusion sapphire, Glass filling Ruby, dying, heat
treatment etc.
Synthetic
gems: Same as natural gem ( in terms of composition, structure, properties and
appearance), except made by man. Or The Gems which have natural counterpart.
For example Synthetic Ruby, sapphire etc.
How to grown synthetic quartz in laboratory by hydrothermal process?
Simulant or imitation: A material ( Natural or Synthetic),
Which has the same appearance as the gem it imitates(look like) but different
chemical composition. For example Cubic Zirconia imitating Diamond, Red Garnet
is the imitation of Ruby.
Assembled gems or composite gems: A gem material
(Natural or Synthetic), which is produced by assembling two or more pieces of
the like or unlike material along a distinct junction. For example opal
triplet, garnet/glass doublet.
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