In a wild case involving a fake NBA-related identity and Tiffany diamonds, Jaythan Lawrence Gilder has opted to represent himself in a Florida courtroom as he faces charges stemming from an alleged jewelry heist. Authorities alleged Gilder stole about $800,000 in diamonds and then swallowed the jewels before his arrest. Gilder, 32, is accused of carrying out the brazen theft at a Tiffany & Co. store at the Mall at Millenia in Orlando, Florida, o…