Andamooka Opal 126 Grams 630 Carats Rainbow Fire For Sale

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Andamooka Opal 126 Grams 630 Carats Rainbow Fire:
$245.00

Let me start by saying that I do not know a thing about gemstones.
I found this one at an estate sale.
Google image search believes it may be an Andamooka Opal, Google also estimated the amount of carats @630ct. based on the dimensions and weight.
It looks to be either highly polished or has had a coating applied.
Felt has been glued to the bottom.
I photographed the stone in bright light, in normal room lighting the colors are not as defined.
Check out my other sale for another large piece of Andamooka Opal.
U.S. registered buyers only.
Thanks For Taking A Look!