These gem stones are made of pulverized stone mixed with a resin so that the pen will turn to the shape desired.  You wouldn't believe how cool these pens look.  You can see pictures of the pens made so far by Rebecca below.  These cost a little bit more but, they are WELL worth the investment.  Giving a pen made with this stone exceeds your gift giving expectations.

You can't tell how beautiful these are from this picture...the pen has weight to it but, is evenly balanced.  The Blue Lapis is a rich blue with gold veins..the malachite is gorgeous as well...have made 2 or 3 pens of the Turqoise...really beautiful stuff if you're looking for one of a kind and custom made with someone in mind.

Green Malachite pen made for a local jeweler in Daytona Beach.

This is beautiful Turqoise oversized Kushi pen...a nice, heavy writing pen but, feels so good in your hand.  Every pen is unique.