• Hardness

  5.5 - 6.5.

• Occurrence

  Australia, former Czechoslovakia, U.S., Brazil, Mexico and southern Africa. Opal and tourmaline are the birthstones of the month of October.

• Appearance

  Iridescent, and opalescent with a wide range of internal colors.

• Enhancements

  Opal is rarely impregnated with colorless oil, wax and resins.

  More information on gemstone enhancements.

• Cat's Eye Opal

• Mexican Black Opal

• Mexican Cherry Opal

• Mexican Fire Opal

• Mexican Jelly Opal

• Mexican Matrix Opal

• Opal Doublet

• Peruvian Blue Opal

• Opal

  • Item #OPL111
    	0.52 ct. total
    	6.0x4.0mm Cabochon, Oval Cut
    	White
    	Opaque
    	[N] Not enhanced.
    	only one pair available
    with blue, green and red fire
    Opal	$ 134.99/pair

  • Item #OPL104
    	0.09 ct. total
    	4.0x2.0mm Cabochon, Marquise Cut
    	White
    	Opaque
    	[N] Not enhanced.
    	only one pair available
    with blue, green and red fire
    Opal	$ 119.99/pair

• Calibrated Opal

  Specify size, shape and quality when ordering. Prices are subject to change without notice. Actual carat weight may vary from the average carat weight listed.

  • A White background, medium fire, (color range blue & greens, greens, or blue reds).

  Opal		Quality	A
  Shape	Size	Avg. Weight	Price Each
  Cabochon, Round	1.5mm	0.01	$ 1
  	1.75mm	0.02	$ 1
  	2mm	0.03	$ 2
  	2.25mm	0.04	$ 2
  	2.5mm	0.05	$ 3
  	2.75mm	0.06	$ 4
  	3mm	0.07	$ 3
  	3.25mm	0.09	$ 4
  	3.5mm	0.11	$ 6
  	3.75mm	0.12	$ 6
  	4mm	0.16	$ 8
  	4.5mm	0.23	$ 11
  	5mm	0.27	$ 13
  	5.5mm	0.40	$ 19
  	6mm	0.48	$ 23
  	6.5mm	0.66	$ 32
  	7mm	0.75	$ 36
  	8mm	1.16	$ 67
  Cabochon, Oval	5x3mm	0.15	$ 7
  	6x4mm	0.27	$ 13
  	7x5mm	0.43	$ 21
  	8x6mm	0.75	$ 43
  	9x7mm	1.05	$ 61
  	10x8mm	1.48	$ 95
  	11x9mm	2.08	$ 160
  	12x10mm	2.66	$ 213
  Cabochon, Pear	5x3mm	0.13	$ 6
  	6x4mm	0.23	$ 11
  	7x5mm	0.37	$ 22
  	8x5mm	0.44	$ 26
  	9x6mm	0.75	$ 48
  	10x7mm	1.00	$ 71
  Cabochon, Marquise	4x2mm	0.06	$ 3
  	5x2.5mm	0.08	$ 4
  	6x3mm	0.15	$ 7
  	8x4mm	0.33	$ 16
  	10x5mm	0.56	$ 33
  	12x6mm	0.99	$ 70
  	15x7mm	1.66	$ 133
  Cabochon, Heart	4mm	0.14	$ 7
  	5mm	0.26	$ 13
  	6mm	0.45	$ 22
  	7mm	0.63	$ 37

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Last updated December 7, 2007
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