Hey Adam,
It may be possible to use a color enhancer to highlight the inserts but you will have to test. We had a floor like this recently and we were able to use an htc green diamond pad on a makita
to polish the inserts dry at high speed. It may or may not work call me if you want more details. As far as the gray grout lines we always use a powder black dye in our honing powders when working with those colored grouts. Eastern marble carries a whole line of these colors and a little pinch goes a long way.
You can go back and use some of the dye mixed with water and sort of push it into the grout lines with a small brush. Clean excess off.
In some cases we could put a pinch on the floor and run the floor machine over it with a white pad after you apply some water to it let the wet vac suck up the excess along with a sponge.
Test first to make results you get the correct results. 

On Mon, Nov 8, 2010 at 10:32 PM, <info@restoreyourtiles.com> wrote:
No I don't, its been 3 weeks ago when we diamond honed the floor and finished with 600 grit powder honing. We cleaned the grout with our turbo back then  but now there are only inserts that customer wants to polish, not entire floor so I am looking for fast and easy way to do that without spending too much time cleaning.
Adam Bartos
BiO Tile.
Sent via BlackBerry from T-Mobile

-----Original Message-----
From: "J. Palacio" <flooramor@aim.com>
Date: Mon, 8 Nov 2010 21:56:40
To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>
Reply-To:"Restoration and Maintenance" <sccpartners@stoneandtilepros.com>
Subject: RE: [sccpartners] polishing travertine inserts with black grout

Hey,

What I am talking about is Grout Perfect color sealing. Since it is
sanded grout, it should be a perfect candidate. You would be color
sealing the grout. John Freitag is the trainer on this now. He should
be able to chime in tomorrow and offer more tips or insight.

How big is the area? When you say that you cleaned it very well was
this after polishing?

You don't happen to have a picture of this floor do you?

Joy,

J. Palacio
www.flooramor.com
954-347-8545

On Nov 8, 2010, at 9:43 PM, info@restoreyourtiles.com wrote:

> This is sanded grout and  I cleaned very well but it became gray
> when dried.
> What do you think about color enhancer sealer?
> Sent via BlackBerry from T-Mobile
>
> -----Original Message-----
> From: "J. Palacio" <flooramor@aim.com>
> Date: Mon, 8 Nov 2010 19:00:39
> To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>
> Reply-To:"Restoration and Maintenance" <sccpartners@stoneandtilepros.com
> >
> Subject: RE: [sccpartners] polishing travertine inserts with black
> grout
>
> Hey Adam,
>
> Just some suggestions;
> 1. Don't let the polishing powder dry on the grout.
> 2. May have to color seal the grout in the end. Is it sanded or
> unsanded grout?
>
> Respectfully,
>
> J. Palacio
> www.flooramor.com
> 954-347-8545
>
> On Nov 7, 2010, at 3:34 PM, Info Info wrote:
>
>> Partners,
>> One of my customers asked me to polish honed, thumbled travertine
>> mosaic inserts. We powder honed her floor 3 weeks ago and now she
>> wants to
>> add a little accent to the floor. The problem is with the black grout
>> between those 1"x1" tiles that make up those inserts - it takes so
>> much time
>> to get them looking good and match grout with the rest of the floor.
>>
>> Is there a way to polish them with out messing the grout?
>> Adam Bartos
>> BiO Tile
>> 773-575-5515
>>
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>
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Regards,
Stu Rosen
201-446-1200
www.mbstonecare.com
www.stoneshine.com
"A posse ad esse "