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level: Observation

Questions and Answers List

Question	Answer
When looking at gemstones, which two main features should be taken into consideration?	External and Internal
What is the name for these internal gemstone features that can be either solid, liquid or gas?	Inclusions
What is the name of this type of inclusion?	Two-phase
What is the name for this type of inclusion?	Three-Phase
What is the name for these hollow, tube-like inclusions?	Monophase Gas
What is this type of inclusion commonly seen in sapphires and rubies?	Colour zoning
What is this type of inclusion, also referred to as a "centipede" inclusion?	Stress Crack
What is this kind of inclusion, also known as rutile?	Monophase solid
What metric term is the weight of a gemstone usually recorded in?	Carat
What is this type of inclusion that shows stress fractures around a crystal?	Lily pad
What type of inclusion existed before the host crystal grew as a mineral particle?	Protogenetic
What is the name for inclusions that are formed at the same time as the host material?	Syngenetic
What type of inclusions are formed after the host material has stopped growing?	Epigenetic
What type of inclusion can be in indication of heat treatment damage in a gemstone?	Stress Cracks
What type of treatment is indicated by a long bore hole seen under magnification?	Laser drilling
What is the name of the instrument used two see two different colours in one stone via two polarizing filters at right angles to one another?	Dichroscope