After viewing the videos on this site I'm more convinced it is an Ethiopian Welo opal.
EthiopianOpals.com web site
In particular it is a two tone yellow and clear base. It has about 1/4-1/3 that is the yellow base and the rest is more milky white and clear. You can see this in the far right picture in the title bar.
One of the videos shows the two tone. Another shows a "Rare Yellow base crystal". I was wondering about this yellow portion of mine and this explains it.
There is also this quote on the web site:
"The color play is face up and in a lot of cases, as bright in artificial
indoor light as it is in direct sunlight. This opal just loves any
light source.
This is hydrophane opal which when soaked in water allows the base color
to clear up...sometimes highlighting the play-of-color, sometimes
making it vanish."
This has certainly been my experience. Indoor light is stunning. Mine seems to clear up the base color when wet and highlight the play of color. Also the ribbon pattern shows through right to the top surface very clearly after it has been wet.
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