kelvin A unit used to measure light temperature.
key color The color of the light refracted out of a faceted gemstone; the color of the gem's brilliance or sparkle.
Of the many kinds of lamps examined in this article - incandescent, fluorescent and discharge - the 6000° Kelvin xenon short-arc lamp appears closest to meeting the criteria for a standard light source.
A light Source with a color temperature of 5,000 to 5,500 degrees Kelvin is used as a basis for color graduation, as well as a master set of brilliants the Position of which within the color grade has been established.
Warmth or coolness of the lamp/bulb, measured in Kelvin (K). The higher the temperature the cooler the appearance of the light. The higher the temperature the greater the blue component in the spectrum and the smaller the red component.
Here at The Natural Sapphire Company, we use standard full spectrum lighting 5000-5500 Kelvin Temperature bulbs.
A "Gem Light Box" gives off a stable 4800 to 5200 Kelvin degrees (natural, indirect sunlight). Some light boxes have a UV component to the light for grading pearls or colored stones (Fraunhofer Solar Spectrum Chart, below).
Aluminium is a good thermal and electrical conductor, by weight better than copper. Aluminium is capable of being a superconductor, with a superconducting critical temperature of 1.2 Kelvin.[citation needed]
[edit] Applications ...
Thermal Conductivity: diamond conducts heat better than anything - five times better than the second best element, Silver!
Melting Point: diamond has the highest melting point (3820 degrees Kelvin)! ...
 See also: Gemstone, Diamond, Color, Stone, Gemstones
  
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