P. D. Gems

Natural opal doesn't have this flexibility and also experiences exponential increase in cost with increase in size.
MexiFire is a very high quality created stone and its physical properties and chemical composition are similar to natural Opal. It is a created stone and scores over simulants as it doesn't have plastic in its composition.
Mexican fire opal stone is a very durable stone. It doesn't demand any special effort to maintain its quality. Unlike natural opal, which can craze because of high water content. Mexican fire opal stone doesn't craze even after repeated exposure to natural elements. During jewelry manufacturing and cleaning process, mexican fire opal stone should not be exposed to high temperature or sudden heating and cooling. As with natural fire opal, mexican fire opal stone should not be subjected to chemicals such as those used for gold or rhodium plating or strong acids etc.
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Mexican gemstone that responds brilliantly to certain kind of cuttings that bring out its color. Fine cabochon cutting will bring out the transparency in mexican gemstone. It also increases in beauty when it's cut in facets to bring out its fireworks.

Properties	MexiFire	Natural Fire Opal
Color	Yellow/Orange Red	Yellow/Orange Red
Refractive Index	1.37 - 1.46	1.37 - 1.46
Transparency	Transparent	Transparent to Opaque
Crystal System	Amorphous	Amorphous
Dichroism	Singly Refractive	Singly Refractive
Hardness	5.5 - 6.5	5.5 - 6.5
Specific Gravity	1.70 - 2.00	1.25 - 2.23
Composition	SiO2 n H20	SiO2 n H20
Crazing	No Crazing	May craze