Opal Gemstones

  • Hardness

    5.5 - 6.5 on the Mohs scale.

  • 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.

Opal Varieties
Opal Varieties

Black OpalBlack Opal
Cat's Eye OpalCat's Eye Opal
Mexican Black OpalMexican Black Opal
Mexican Cherry OpalMexican Cherry Opal
Mexican Fire OpalMexican Fire Opal
Mexican Jelly OpalMexican Jelly Opal
Mexican Matrix OpalMexican Matrix Opal
Opal DoubletOpal Doublet
Peruvian Blue OpalPeruvian Blue Opal

Opal
Opal

OPL607
OPL607
 0.03 ct., 'A' Grade
2.5mm Cabochon, Round Cut
Colorless
Slightly Translucent
[N] Not enhanced.
One of a kind.
With blue and green fire.
Opal

OPL609
OPL609
 0.08 ct. total, 'A' Grade
4.0x2.0mm Cabochon, Marquise Cut
White
Translucent
[N] Not enhanced.
Only one pair available.
With green and red fire.
Opal

Calibrated Opal
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.

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

Opal Quality AAA AA A
Shape Size Avg. Weight Price Each
Cabochon, Round CutCabochon, Round Cut
1.5mm
0.01 ct.
  
1.75mm
0.02 ct.
  
2mm
0.03 ct.
  
2.25mm
0.04 ct.
  
2.5mm
0.05 ct.
  
2.75mm
0.06 ct.
  
3mm
0.13 ct.
3.25mm
0.09 ct.
  
3.5mm
0.11 ct.
  
3.75mm
0.12 ct.
  
4mm
0.16 ct.
4.5mm
0.23 ct.
  
5mm
0.37 ct.
5.5mm
0.41 ct.
  
6mm
0.72 ct.
6.5mm
0.66 ct.
  
7mm
0.71 ct.
  
8mm
1.09 ct.
  
 
  AAA AA A
Cabochon, Oval CutCabochon, Oval Cut
4x3mm
0.11 ct.
  
5x3mm
0.18 ct.
6x4mm
0.30 ct.
7x5mm
0.62 ct.
8x6mm
0.94 ct.
9x7mm
1.10 ct.
  
10x8mm
2.01 ct.
11x9mm
2.00 ct.
  
12x10mm
2.66 ct.
  
14x10mm
4.12 ct.
  
 
  AAA AA A
Cabochon, Pear CutCabochon, Pear Cut
5x3mm
0.13 ct.
  
6x4mm
0.19 ct.
7x5mm
0.49 ct.
  
8x5mm
0.47 ct.
9x6mm
0.88 ct.
  
10x7mm
0.95 ct.
  
 
  AAA AA A
Cabochon, Marquise CutCabochon, Marquise Cut
4x2mm
0.06 ct.
  
5x2.5mm
0.10 ct.
  
6x3mm
~
 
8x4mm
0.37 ct.
  
10x5mm
0.72 ct.
 
12x6mm
0.98 ct.
  
15x7mm
1.99 ct.
  
 
  AAA AA A
Cabochon, Heart CutCabochon, Heart Cut
4mm
0.11 ct.
  
5mm
0.26 ct.
  
6mm
0.45 ct.
  
7mm
0.67 ct.
  

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