This was on ebay a year or two ago...pretty crazy price...


https://www.ebay.com/itm/RARE-Alembic-logo-pendant-sterling-silver/173427132276?hash=item2861100774%3Ag%3AR9cAAOSwBWJbVkhN&_sacat=0&_nkw=alembic&_from=R40&rt=nc&_trksid=p2380057.m570.l1313.TR12.TRC2.A0.H0.Xalembic.TRS0

In this old thread on one of these: http://club.alembicguitars.net/index.php?topic=10589.msg123397#msg123397 Stephen has a catalog where the Sterling pendants sold for $25. 


(this might even be the same one)