This is common problem with white marble. Your client is probably correct. The rusting is coming from within the stone. Based on the photos I would say replacement is the only option. See my article on iron oxidation in the articles section on stoneandtilepros.com to show your client

On Thu, May 9, 2013 at 5:35 PM, Justin Cameron <justin@jmcstoneandtilecare.com> wrote:
I have this potential client and her marble is rusting. The husband is a know it all and assures me there wasn't any rebar used underneath.  Wife says it gradually started to spread. Any ideas to fix or if its a lost cause. 

Justin Cameron
JMC Stone and Tile Care
(951) 972-6997
www.jmcstoneandtilecare com
Serving all of Riverside / San Diego Counties with natural stone and tile care
Marble | Granite | Limestone | Travertine | Porcelain | Ceramic | Saltillo

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Frederick M. Hueston PhD

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