Everything has its own uniqueness. Precious opal shows a play of spectral colours though the stone whereas common opal does not.
Common opal is usually opaque to translucent and brownish orange in colour, however it can come in any colour, some of which are quite attractive.
The Major differential characteriatics
The variety of natural opal is determined by the two characteristics of body tone and transparency.
Body Tone - The base tones of light, dark and black opal range from colourless, white, through the various shades of grey, to black. Transparency - Opal of any body colour will belsn opaque, translucent or transparent.
therefore, their main difference is the body tone and transparent:
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