I can't see close enough to tell, but looks like one of the polymer clays. It's probably "Pearl" with another color mixed into it by the maker** (Pearl is the mica-containing polymer clay which has no added color--like gold, copper, or even blue/red/green.)
Pearl is put out by various brands and lines of polymer clay but not all polymer clays are the same quality, working capabilities, strengths, etc.**.
Fimo is one brand that puts out mica-containing clays under their FimoSoft line (some pre-colored I think, as well as their "Mother of Pearl"). They also make clays with glitter
in them which often won't look the same but can create interesting glittery effects if the glitter is microfine
--those won't do all the special tricks** that mica-containing clays can do though when used alone
...you can't even see those effects in this sample.
If you're interested in mica-containing clays including colorless Pearl, brands of them and how they can be used, check out this page at my site:http://glassattic.com/polymer/mica.htm
And this page at my site has info about making sculptural flowers with polymer clay, if you're interested:http://glassattic.com/polymer/sculpture.htm
(click on *Flowers & Leaves*)
...and using clay items as "onlays" onto other clay surfaces, as done there:http://glassattic.com/polymer/onlay.htm
(click on *Dimensional Onlays*)
** on this page and the next few pages there, you can see examples of Pearl colored by the clayer (with different colors) as well as some of the special tricks it can do:http://www.clayfactory.net/pier/PIER1.htm
*** brands and lines of polymer clay:http://answers.yahoo.com/question/index;_ylt=Ah3TmxMH1b9StHBwtkaivEIW53NG;_ylv=3?qid=20091225104704AAIDebT