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Gem Resources
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Minneapolis, MN 55426

Phone: (612) 664-0252
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Shop Talk Gem Info

Mexican Opal

Hardness: 5 - 6.5
Specific Gravity: 2.15
Refraction Index: 1.45
Species: Silica Gel
Treatment: None
Care: Never clean ultrasonically, hot water or steam clean.

Opal is one of the October birthstones.  The name opal comes from the Greek Opallos, meaning "to see a change of color."  It is a formation of non-crystalline silica gel that seeped into crevices in the sedimentary strata. Through time and nature's heating the gel hardened into the form of opals.  Beliefs associated the powers of foresight and prophecy, hope and purity.  



Oval Facet

5 x 3 mm $6.00 each 2 pieces $10.00
6 x 4 mm $10.00 each 2 pieces $18.00
7 x 5 mm $19.00 each 2 pieces $33.00



Emerald Cut Facet

5 x 3 mm $8.00 each 2 pieces $13.00
6 x 4 mm $12.00 each 2 pieces $20.00



Square Facet

4 mm $7.00 each 2 pieces $12.00
5 mm $13.00 each 2 pieces $22.00



A11 Precious Mexican Jelly Opal

4.92 carats $85.00



A15 Precious Mexican Jelly Opal

7.33 carats $155.00



A16 Precious Mexican Jelly Opal

9.70 carats $270.00



A17 Precious Mexican Fire Opal

14 x 12 x 7 mm 6.50 carats $150.00



A18 Precious Mexican Fire Opal

6.48 carats $130.00



A21 Precious Mexican Fire Opal

10.5 x 8 x 7 mm 3.83 carats $125.00



A22 Precious Mexican Fire Opal

3.09 carats $90.00



A25 Precious Mexican Jelly Opal

12 x 7 x 5 mm 2.00 carats $40.00



A26 Precious Mexican Jelly Opal

9 x 7.5 x 4 mm 1.43 carats $35.00



A27 Precious Mexican Jelly Opal

7.5 x 5.5 x 3.8 mm 1.09 carats $22.00



A28 Precious Mexican Jelly Opal

3.77 carats $80.00



A33 Precious Mexican Fire Opal

7.69 carats $220.00

 
 
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