Gem Identification 1

The kinds and relative quantities of atoms in a material make up its

Chemical Composition

The regular, repeating internal arrangement of atoms in a material is its

Crystal Structure

Orthoclase is a species of

Feldspar

A broad gem category based on chemical composition and crystal structure is a

Gem Species

A subcategory of species that's based on a gem's color, transparency, or phenomenon is a

Gem Variety

A subcategory of species, based on color, transparency, or phenomenon

Gem variety

A family of gems made up of several closely related mineral species is called a

Group

Before you can grade or assess the value of a gem, you must

Identify it

Any material that looks like a natural gem and is used in its place is a

Imitation Gem

Composed of, or arising from, non-living matter is

Inorganic

Substitution of chemical element for another in the crystal structure of a material

Isomorphous replacement

A natural inorganic substance with a characteristic chemical composition and usually a characteristic structure

Mineral

A natural, inorganic substance with a characteristic chemical composition and usually characteristic structure is a(an)

Mineral

Gems produced by a living organism are

Organic

Produced by or derived from a living organism

Organic

Moonstone is a variety of

Orthoclase

Pyrope, almandite, and spessartite are all what colored species of garnet?

Red

Process of distinguishing natural gems from each other as well as from synthetics, simulants, and treated gems is

Seperation

A laboratory creation with essentially the same chemical composition, crystal structure, and properties as its natal counterpart

Synthetic

A laboratory creation with essentially the same chemical composition, crystal structure, and properties as its natural counterpart is called a(an)

Synthetic Gem

Atoms in a gem that aren't part of its essential chemical composition are

Trace Elements

In the jewelry business, an incorrect gem identification

can damage your reputation and cost you money.

An amorphous gem is one that

lacks a regular crystal structure

Isomorphous replacement occurs when

one chemical element substitutes for another in a mineral's crystal structure

An unusual optical effect displayed by a gem is a

phenomenon

While working with practice stones, avoid getting them mixed up by

working on only one stone at a time