Robert Best's "Silkstone" Barbie Fashion Model Collection is considered by many doll collectors to be the pinnacle of Barbie.  These dolls were inspired by the aesthetic of the vintage original and have been elevated with elegant fashion using high end textiles and immaculate attention to detail.  Their bodies are made of a dense, heavy weight vinyl that is intended to resemble the feel of porcelain.

This is the "Delphine" doll, released in 2000 as a limited edition.

From the back:

Doll has never been removed from box.  She is packed neatly and intact.  All pieces appear to be present.  Her clothing is clean and shows no signs of display.  Her hair is neat and tidy.  The box has some discoloration on the surface (see pictures).    Artificial materials or elastics may be weak or degraded from age and were not tested for their integrity.