( ( Most ( gem minerals ) ) ( ( ( ( ( ( lack ( metallic bonding ) ) and ) ( thus ( are nonconductors ) ) ) , ) ( with ( ( the exception ) ( of ( ( natural ( and ( synthetic ( blue diamonds ) ) ) ) ( that ( do ( conduct electricity ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJS Most) (NN gem) (NNS minerals)) (VP (VP (VBP lack) (NP (JJ metallic) (NN bonding))) (CC and) (VP (ADVP (RB thus)) (VBP are) (ADJP (JJ nonconductors))) (, ,) (PP (IN with) (NP (NP (DT the) (NN exception)) (PP (IN of) (NP (NP (JJ natural) (CC and) (JJ synthetic) (NN blue) (NNS diamonds)) (SBAR (WHNP (WDT that)) (S (VP (VBP do) (NP (NN conduct) (NN electricity)))))))))) (. .)))
Most gem minerals lack metallic bonding and thus are nonconductors, with the exception of natural and synthetic blue diamonds that do conduct electricity.
(ROOT (S (NP (DT A) (JJ synthetic) (NN diamond)) (VP (VBZ is) (RB not) (VP (VBN considered) (NP (DT a) (NN mineral)) (SBAR (IN because) (S (NP (NNS minerals)) (VP (MD must) (VP (VB be) (VP (VBN created) (ADVP (RB naturally))))))))) (. .)))