Opal is formed when the seasonal rains drench into dry ground in regions such as Australia. Opal exhibits unique display of rainbow colors called play of color. Opal with play of colors is more expensive than the ones in which it is absent. Opal is the birthstone of October.
These opals are either translucent or opaque with play of color against a gray or white background.
Moh Hardness- 5 to 6.5
Origin- Ethiopia and Australia.
These are again either translucent or opaque with play of color on black background.
Moh Hardness- 5 to 6.5
Origin- Ethiopia and Australia.
These opals are either transparent or translucent with yellowish orange, brown or red bodycolor. The fire opal with no play of color is often referred as Mexican Fire Opal.
Moh Hardness- 5 to 6.5
Origin- Mexico.
These opals are translucent to opaque with play of color against a light to dark background.
Moh Hardness- 5 to 6.5
Origin- Australia.
These are the ones which are transparent to semitransparent with a very clear background. They have exceptional play of color.
Moh Hardness- 5 to 6.5
Origin- Ethiopia and Australia.
