This is a genuine 2000 Sakagawea One Dollar Golden Coin produced by the U.S. Mint at Philadelphia and encased in a golden alloy and made into a prestigious bracelet.  I have not been able to find much history on this bracelet but we all know the coin.  I have not found any for sale other than one on the Etsy site, and maybe they know more than I know, as the set was priced at $150!  Thanks for looking!