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Green Blue Opal

There are many categories of opal when it comes to grading them out. Opals of all different colors are and have different values depending on the color it displays. You can categorize opals by using the color that is more dominant in the opal as the first name of the opal for example. (Green blue opal) A green blue opal means that the opal has a main color base of green than blue, because the name green comes first. Just as the opal blue green or green orange or orange green or red orange or orange red. These categories are assed by the human eye and an experienced opal dealer…

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