1851 Libery Gold Dollar

Something doesn't look right to me either. The details appear mushy. Two of the stars above the hair appear to have hollow centers which is a bad sign.

The bust appears worn, but the rim is gem? The letters appear too bold on the reverse; the T in UNITED looks like it is touching the berry.

Drsandman2 is right.
Lots of fakes of these exist, made in good quality gold, for jewelry purposes. The design detsils are quite soft, indicating a copy from a genuine coin.

I suspect that coins such as these were not necessarily made to deceive, but for honest jewelry purposes. I so doing a genuine gold dollar would have been saved from a rather rugged existence. By copying a genuine coin in good quality gold, there is no intention of defrauding a potential jewelry customer.

Because of their small size, such copies make for excellent inclusion in a jewelry design. The latter day coin collector was not considered.

sel_60l's post reminded me that jewelers often "copied" the designs for their jewelry. Although coins like this are not government issue, it is very possible they contain gold. It maybe a lower karat. So, they are not completely worthless. There is an old post on here somewhere about it.