With diamonds, as with all gems, one should ask for a written descript

[quote="abhishekdadarwal2009"]With diamonds, as with all gems, one should ask for a written description of one’s purchase; the description may prove useful later if you have reason to believe the jeweler misled you.

[color=#ff0000](A) one should ask for a written description of one’s purchase[/color]
'One' in the underlined part and 'you' in the non underlined part is not consistent.
[color=#00a651](B) you should ask for a written description of your purchase[/color]
correct and consistent with teh 'you' in the non underlined part.
[color=#ff0000](C) a written discretion of your purchase is what one should ask for[/color]
'your' and 'one' is not consistent.
[color=#ff0000](D) a written description of one’s purchase is what should be asked for[/color]
No Acting noun, who is donig the action,in the non underlined part 'you' is used and this is inconsistent.
[color=#ff0000](E) a written description of your purchase is what should be asked for [/color]
No active noun, who is doing the action.[/quote]

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Hello isn’t the word “a written description “ a noun here ? And it has a verb ‘is’ . Why can’t it be the noun of the sentence? Could you please enlighten me ?