Lost ranking for top keyword

[harrykabadaian]

For the last 3 months we've been working on www.UneekJewelry.com to get it rank for "unique engagement rings" and got it to position 14 but since September 18th, 2012 that all changed. The website no longer ranks for our money keyword not even in the top 500. We haven't been building exact match keywords but using more phrase match and I can't tell if its because we don't have enough exact match or something else.

We have been working on trying to figure out what the issue is as they still rank for other keywords like "unique engagement rings in los angeles", therefore we don't know if this is a keyword penalty or glitch in Google, can anyone give us any insight on what could cause such a drop in those specific keywords for our site.

Most of the link building we have done for this client is from in content blogs.  The only blog we were suspicious of we removed the article from that blog two days ago.  The ranking have not come back.

This was the last blog that the exact match keyword was used where we removed the article from:

http://colorfuljewelry.blogspot.com/

Thanks,

[benjaminspak]

It's not just you I have seeing flux, so have people like Cyruss Shepard. I'm assuming it's another rollout of on of the new updates. SEO Moz has been showing flux as well http://mozcast.com/

[OnlineAssetPartners]

I think the problem is that most of your linking was done using the one method, which is always a pattern. Have you done a press release maybe using just the domain as a link?

I have seen sites bounce around like this, and come back within 14 days, I would say keep going with your promotion, also adding more twitter and facebook (social presence)

I took a look at your home page and didnt see much content to "hang on to" - here is a good example in the diamond market: http://www.1791diamonds.com/

[harrykabadaian]

We've been super active with Facebook and actually the last two months added 8000 fans. We also have a Facebook contest active at this time. http://www.facebook.com/UneekFineJewelry

[harrykabadaian]

Going from position 14 to completely disappearing ?