Before you buy a color stones or Diamonds, you need to know some fact about Color stones.
What many consumers see as the “color” of a diamond is really a combination of body color; brilliance, and dispersion, key elements which can help you explain color, cutting, and beauty to your customers. Each is affected by both the basic nature of the diamond crystal, and the cutting proportions selected by the cutter. When gem professionals speak of color, they usually mean body color, the basic color of an object. It results from selective absorption, which causes most of what we normally think of as color.
This is how it works:
All white light is a balanced blend of different colors of light. When white light is reflected by, or passes through, an object, the object may absorb (or subtract) some of the colors; we see the remaining blend as the object’s body color.
• Brilliance is the total amount of light returned to the eye by reflections from within the stone and from its surface. When light strikes the surface of a gem, part of it is reflected immediately and part of it enters the stone. The part reflected from the surface is the external component of brilliance.
• Cutters try to fashion gems so the back facets create an internal mirror effect, reflecting light that comes in from above to bounce back out through the top of the stone. This is the internal component of brilliance; it is largely responsible for the brightness and life of the stone.
• Dispersion, or fire, is a spreading and separating of white light into its component, spectral hues. Prisms produce the most familiar examples of dispersion. Diamonds are more dispersive than most gems, and when consumers spot the rainbow colors, they tend to mistake them for what you are calling the color of the stone (the body color).