https://www.etsy.com/au/listing/470804595/genuine-australian-opal-doublet-genuine

This magnificent genuine Australian Opal has an internal structure of precious opal, which makes it diffract light. Depending on the conditions the opal is formed, it can take on many colors.

This gemstone has a colour play of blue, red, green, violet or orange against a dark background as shown in the pictures above.

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