Diamonds are graded from D to X, with only D, E, and F considered good, D being colorless or  river white,  J  slightly tinted,  Q  light yellow,  and S to X  yellow.  
( Diamonds ( ( are ( ( ( ( graded ( from D ) ) ( to X ) ) , ) ( with ( ( ( ( only ( ( D ( , ( E ( , ( and F ) ) ) ) ) ( considered ( ( ( ( good ( , ( D ( being colorless ) ) ) ) or ) ( river ( ( white ( , ( J ( slightly ( tinted , ) ) ) ) ) ( Q light ) ) ) ) yellow ) ) ) ) , ) and ) ( ( S ( to X ) ) yellow ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Diamonds)) (VP (VBP are) (VP (VBN graded) (PP (IN from) (NP (NNP D))) (PP (TO to) (NP (NNP X))) (, ,) (PP (IN with) (S (S (ADVP (RB only)) (NP (NNP D) (, ,) (NNP E) (, ,) (CC and) (NNP F)) (VP (VBD considered) (S (NP (NP (JJ good) (, ,) (JJ D) (JJ being) (NNS colorless)) (CC or) (NP (NN river) (ADJP (JJ white) (, ,) (IN J) (RB slightly) (JJ tinted) (, ,)) (NNP Q) (NN light))) (ADJP (JJ yellow))))) (, ,) (CC and) (S (NP (NP (NNP S)) (PP (TO to) (NP (NNP X)))) (ADJP (JJ yellow))))))) (. .)))
Diamonds are rated alphabetically, the ones from D to F are considered the best.
( ( Diamonds ( are ( rated alphabetically ) ) ) ( , ( ( ( the ones ) ( from ( D ( to F ) ) ) ) ( ( are ( considered ( the best ) ) ) . ) ) ) )
(ROOT (S (S (NP (NNS Diamonds)) (VP (VBP are) (VP (VBN rated) (ADVP (RB alphabetically))))) (, ,) (NP (NP (DT the) (NNS ones)) (PP (IN from) (NP (NP (NNP D)) (PP (TO to) (NP (NN F)))))) (VP (VBP are) (VP (VBN considered) (NP (DT the) (JJS best)))) (. .)))