The Jade Buddha Of Khotan is a jadeite jade statue of Buddha. Dr. Enrico Gonzales finds it in an iceberg and launches it in Twinford. There is a myth that the first person to look at it at the stroke of midnight gets to half his age and double his wisdom. Count Von Viscount attempts to steal it but is foiled by Ruby in Ruby Redfort, Look Into My Eyes. Ruby comments that the Count was seen shining a torch into its eyes, possibly trying to find some hidden code
In the last book, we find out that the eyes reveal the location to the Mars Mushrooms.