Simple as can be dark oval gemstone pendant necklace on a black satin cord.  Oval gemstone is approximately 1/2 x 5/8 inches (12x15mm) and has been wire wrapped into a simple pendant by me with 14k gold filled wire.  I have placed this pendant on a thin, 18 inch (45.5cm), 1mm black satin cord with a gold plated spring ring clasp.  The gemstone used has a dark green/black base with a bloom of white tracery and coffee colored areas.