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level: How to look at gems

Questions and Answers List

level questions: How to look at gems

Question	Answer
What type of lustre, seen in diamonds, is very bright and reflective?	sub-adamantine
What type of lustre is bright and glossy, often seen in coloured, transparent gemstones?	Sub-Adamantine
What optical effect is seen in transparent gemstones, that produces flashes of colour?	Fire
What is the tool most commonly used by jewellers to look at gemstones?	10x Loupe
Which name refers to the cut and polished flat faces on the surface of a gemstone?	Facet
What cut refers to a gemstone that has a domed, polished top and a flat base?	Cabochon
What types of gemstones allow light to pass through them to the extent that objects placed behind them can be seen clearly?	Transparent
What types of gemstones allow some light to pass through, but objects seen through them are indistinct or not visible at all?	Translucent
What type of gemstones allow no light to pass through, and objects cannot be seen through them?	Opaque
What type of lustre is seen in polished gemstones such as haematite, as well as polished metals?	Metallic
What type of lustre, often seen in uncut gems or even ordinary glass, is glossy and sometimes slightly dull?	Vitreous
What is the name of the "cats eye" effect seen in some stones caused by light reflecting off of channels or inclusions within the gem?	Chatoyancy
What is the name of the star effect seen in some stones caused by light reflecting off of channels or inclusions within the gem?	Asterism
What is the most common colour observed in sapphire?	Blue
What is the colour most commonly observed in sapphires?	Blue
What is the most common colour observed in rubies?	Red
What is the most common colour observed in Emeralds?	Green
What is the name for a person/scene carved into a shell or hard stone?	Cameo
What is the name of the most common cut for a diamond?	Brilliant
Which term refers to the quality and quantity of light reflected from the surface of a gemstone?	Lustre