What is the best conductor of heat? (at a temperature 20°C and relative humidity 50%)

Diamond
131
Water
222
Graphene
929
Cellulose
208
Graphene has many unusual properties. It is the strongest material ever tested,efficiently conducts heat and electricity and is nearly transparent. The material , isolated, and characterized in 2004 by Andre Geim and Konstantin Novoselov at the University of Manchester. Research was informed by existing theoretical descriptions of its composition, structure, and properties This work resulted in the two winning the Nobel Prize in Physics in 2010 "for groundbreaking experiments regarding the two-dimensional material graphene."
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