I'm a huge fan of dials that seem to change appearance depending on the lighting conditions. One of the more unusual examples of this that I've seen is with my Girard Perregaux Richeville 2750. In some lights, it appears to be a very vibrant blue, but in other lights, it appears to be totally black. As a huge Seinfeld fan, this watch reminds me of the episode with the "two face" girlfriend.
Do you have any watches that look considerably different depending on the light?
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Can you share some photos of your ISL-92 to show the difference? It sounds like a very similar effect.