Is This Kimberlite?

[Kit426]

Are these diamonds? 

And/or possibly a piece of a meteorites?

[Jeff McClendon]

That is not kimberlite or a meteorite. They are great photos. It looks like a volcanic tuft or breccia or caliche with lots of quartz/quartzite fragments. 

Kimberlite can definitely be a yellowish color when it has been exposed on or near the surface of the earth for awhile. Otherwise it is usually a grayish blue. It does not have large fragments of quartz like your specimen. Neither do the vast majority of meteorites which have very little or no visible quartz.