Interesting Case Study. Website with 70 PA and 73 DA but PR 0?
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http://www.jewelry.hyper-info.com/
This website has no backlinks reported on google, but loads of backlinks across the web.
It also doesn't even rank top 50 on its topic keyword [Jewelry Tips].
I would be very wary of building a link on a site like this, but thats my opinion.
How would you rate this websites link based on this data?
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I would not get a link from this as it seems very suspicious, are you sure the subdomain has links pointing to it?
Otherwise, I would suspect a penalty from google that has not been resolved.