I can show you lots of pics just like that one-These type of installs can get what seems to be dampening stains. The install is new and hardly used and there is an area or areas that have darkened.
They don't seem to get any better in most cases.
Looking at your pic again-seems to be showing signs of yellowing- 

On Fri, Oct 7, 2016 at 11:26 AM, Pat Staples <cpstaples@msn.com> wrote:
Any cracks in the joint lines to where water is getting in?



Sent from my Sprint Samsung Galaxy S7.


-------- Original message --------
From: Justin Cameron <justin@jmcstoneandtilecare.com>
Date: 10/7/16 11:14 AM (GMT-05:00)
Subject: Re: Marble shower

Thanks guys.
I told her about the moisture possibility let it dry see if there's a difference but she's saying that pic was taken about week and a half later hasn't been used and still looks like that. 
Thanks
Justin

Sent from my iPhone

> On Oct 6, 2016, at 10:20 AM, Stu Rosen <rosen.stuart@gmail.com> wrote:
>
> Agree with Chris
> Tread lightly
> Bad spec of material
>
> Sent from my iPhone
>
>> On Oct 6, 2016, at 12:42 PM, csantospago@gmail.com wrote:
>>
>> Looks like moisture. White marble always gets dark when it's wet. The first step would be to find where the moisture is coming from and then resolve it. Then try to dry it out and hopefully no iron staining will result.
>>
>> Sent from my iPhone
>>
>>> On Oct 6, 2016, at 11:24 AM, Justin Cameron <justin@jmcstoneandtilecare.com> wrote:
>>>
>>> Hi folks
>>> I got these pics sent to me from a designer who's new install shower has discoloring. I haven't seen in it in person but just wanting some further input on why and a solution
>>> Thanks again
>>>
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Regards,
Stu Rosen
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