I have made this graduated pearl necklace using Swarovski irridescent dove grey pearls in 3 different sizes, and inserted swarovski a.b crystals into it so that they sit on the collarbone.  The pendant is a swarovski crystal pure drop crystal AB with a rhodium plated trumpet cap.
 
The clasp on the necklace is 925 sterling silver.
 
The necklace is approximately 19 inches / 47 cms in length and the pendant is 0.75 inches / 21mm long. 
 
Swarovski pearls are suitable for vegans.