Colored Stone Essentials 1
Federal Trade Commission (FTC)
A US government agency that issues guidelines for the jewelry trade
Gem Species
A broad gem category based on chemical composition and crystal structure
Group
A family of gems from several closely related mineral species
Durability
A gemstones ability to withstand wear, heat, and chemicals
Mineral
A natural, inorganic substance with a characteristic chemical composition and usually a characteristic structure
Gem Variety
A subcategory of species: based on color, transparency or phenomenom
Which of these is an example of an organic gem?
Amber
Minerals that do not have a regular crystal structure are
Amorphous
A gem's variety is most often based on its
Color
One of the most obvious effects of a trace element in a mineral is
Color
Inorganic
Composed of, or arising from, non-living matter
The regular, repeating internal arrangement of atoms in a material is called
Crystal Structure
Transparency
Degree to which a material allows light to pass through it
Natural Gems
Gems produced by natural processes, without human help
A gem that is not easily scratched has good
Hardness
Toughness
How well a gemstone resists breaking, chipping, and cracking
Hardness
How well a gemstone resists scratches and abrasion
Stability
How well a gemstone resists the effects of light, heat, and chemicals
All minerals are
Inorganic
Chemical Composition
Kinds and relative quantities of atoms that make up a material
Synthetic Gems
Lab creations with essentially the same chemical composition, crystal structure and properties as its natural counter part
Amorphous
Lacking a regular crystal structure
The appearance of a material's surface in reflected light is called
Luster
Most gems are ....
Minerals
Organic
Once living, or produced by a living organism (plant or animal)
No light getting through a gemstone means it's
Opaque
Gems that come from plants and animals are called
Organics
All gems possess some degree of these three traits..
Rarity, beauty, durability
crystal structure
Regular, repeating internal arrangement of atoms in a material
A gem that is not easily affected by light, chemicals, or heat has good
Stability
Which of the following terms should you use in a sales presentation to describe a manmade emerald?
Synthetic Emerald
Luster
The appearance of a materials surface in reflected light
Gemology
The study of gems
A gem's resistance to chipping, breaking, and cracking is called
Toughness
chemical formula
Written description of a materials chemical make-up
phenomenon
An unusual optical effect displayed by a gem
Colored Stone
Any gem material other than diamond
Trace Elements
Atoms in a gem that arent part of its essential chemical composition
All members of a gemological species have essentially the same
Chemical Composition
The types and relative quantities of the atoms in a mineral make up its
Chemical Composition
