Card Set Information
GIA Essential Colored Stones
Clarity Cut & Weight
What is a Blemish?
Characteristic or irregularity
confined to surface of polished stone.
What is an Inclusion?
Characteristic enclosed w/in gem or reaching the surface:
2) Pocket of Fluids
3) Foreign Mineral Crystals
3 basic types of Breaks "Feathers"?
*In the trade breaks are called "Feathers" b/c they often look
Most threatning type of break b/c of vulnarability in the Crystal Structure-
Flat break w/ step-like appearance
Topaz, Tanzanite, Kunzite & Moonstone (Diamonds) tend to Cleave
A break parralel to
location of a change of direction in a gems
most common in
Any break other than
cleavage or parting
, frequently occur durring gems growth or mining practice
Reach the surface, often treated with epoxy or resin to reduce noticability.
Gem's relative freedom from
Inclusions & Blemishes
Major part of any
Descripton for gem w/ inclusions only visible under magnification
Mineral Crystal trapped w/in a gem as it grows
Small pocket in gem thats filled w/ fluids & sometimes gas bubbles & tiny crystals