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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:
- 1) Breaks
- 2) Pocket of Fluids
- 3) Foreign Mineral Crystals
3 basic types of Breaks "Feathers"?
- 1. Cleavage
- 2. Parting
- 3. Fracture
*In the trade breaks are called "Feathers" b/c they often look white
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 Twinning Plane, location of a change of direction in a gems Crystal Structure durring growth
Black Sapphires, most common in
Any break other than cleavage or parting
Often have scallop shape, 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 Transparent stone's Value
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
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