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level: The visible spectrum, light and colour

Questions and Answers List

level questions: The visible spectrum, light and colour

Question	Answer
The visible spectrum is the full range of what?	Wavelengths and colours
Each colour in the visible light spectrum has its own..	Wavelength
What six colours are there in the visible spectrum?	Violet
What is the approximate wavelength for violet light?	400-450nm
What is the approximate wavelength for green light?	490-560nm
What is the approximate wavelength for yellow light?	560-590nm
What is the approximate wavelength for orange light?	590-610nm
What is the approximate wavelength for red light?	610-700nm
The colour we see in gemstones is produced during the modification of..	White light
The three distinct causes of colour in gemstones are..	Diffraction, absorption and dispersion
What is the term used to describe chemical elements that give a gemstone it's colour?	Colouring elements
What is the term used to describe colouring elements that form an essential part of the gems atomic structure?	Idiochromatic
What is the term used to describe gem materials where the colouring elements are non-essential, present only as an impurity?	Allochromatic
Most colouring elements are metallic, what two elements are the only two non-metallic colouring elements?	Boron
The metalic colouring element titanium (Ti) causes what colour in gemstones?	Blue
The metalic colouring element vanadium (V) causes what colours in gemstones?	Green and pink
The metalic colouring element chromium (Cr) causes what colour in gemstones?	Red and green
The metalic colouring element iron (Fe) causes what colours in gemstones?	Green, blue, yellow and red
The metalic colouring element colbalt (Co) causes what colour in gemstones?	Blue
The metalic colouring element nickel (Ni) causes what colour in gemstones?	Green
The metalic colouring element copper (Cu) causes what colour in gemstones?	Blue and green
What is the colouring element that gives peridot it's green colour?	Iron
What is the colouring element that gives almandine garnet it's red colour?	Iron
What is the colouring element that gives spessartine garnet it's orange colour?	Manganese
What is the colouring element that gives turquoise it's blue colour?	Copper
What is the colouring element that gives ruby it's red colour?	Chromium
What is the colouring element that gives emerald it's green colour?	Chromium
What is the colouring element that gives green jadeite it's bright green colour?	Chromium
What is the colouring element that gives alexandrite it's red/green colour?	Chromium
What is the colouring element that gives red spinel it's red colour?	Chromium
What is the colouring element that gives blue spinel it's blue colour?	Iron
What is the colouring element that gives aquamarine it's blue colour?	Iron
What is the colouring element that gives chryoprase quartz it's green colour?	Nickel
What are the colouring elements that give sapphire it's blue colour?	Iron and titanium
What is the colouring element that gives fancy diamonds their yellow colour?	Nitrogen
What is the colouring element that gives fancy diamonds their blue colour?	Boron