That's rust-doesn't look like callacatta gold either.
Iron out for the rust but will probably come back-many variations of white marbles out there today.
I see this a lot-

On Tue, Aug 12, 2014 at 10:07 PM, Tony Warney <> wrote:
Contractor / Fabricator called me. Has a customer with Calcutta Gold that has stained.
It is in a bathroom. Supposedly she has only put her straightening iron on this area. Seeing all the circles I think it might be a chemical reaction. Any ideas?
Thanks Tony

Tony Warney
Excel Stone and Tile Care
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Stu Rosen