Physical property. - Hardness, Toughness, Stability.
Topic : Optical Properties
1. Brilliance, Dispersion, and Sintillation.
Fun TIP: Reflections bounce off stone. Reflection goes into stone and bounces back to you.
-Light => ELECTROMAGNETIC SPECTRUM. <All forms of radiant energy>
lights dispersion include rainbows of color white light and causes dispersion.
-Visible light => 400 nanometers - 700 nanometers
1 nanometer = 10 anxshrum. Example a short wave of light in the center is the visible light of diamonds nanometer between 400-700.
Light => 186,000 miles a second
and light travels in wave like motions.
-Refraction - Abiity of gemstone to slowdown and bend light.
-Refractive Index - (R.I.) Speed of light in air vs speed of light in gem. Diamond is in the center 77,000 vs 186,000
Measures ability of gem to slow and bend light.
R.I. - 2.417 for diamond
Ruby - 1.77 (R.I.)
Emerald - 1.57 (R.I.)
*Total Reflection => A light reflects twice and exits.
Fun TIP: If the diamond is greesy, cavity light scatters. It also effects light reflection.
*Light Leakage => Planned light leakage : Light leaves from crown. Top.
*Unplanned light leakage => Light leaves through pavillion. Bottom.