Bahia

"A 426 lbs. rutilated quartz crystal sculpture is playfully referred to as ‘the world’s largest pendant’ and is one of the highlights of GIA’s collection.
Weighing nearly one million carats, the hanging piece took renowned gem carvers Glen Lehrer, G.G. and Lawrence Stoller more than seven years to create.
The Bahia resides in GIA’s lobby and represents a superb synthesis of gemology and artistic expression."

Source web site of the Gemological Institute of America