Fernando Tatis is shining bright like a diamond at the MLB's 2021 All-Star Week ... rockin' a massive 'El Nino' diamond chain --- worth $200k!!
The San Diego Padres shortstop's nickname is 'El Nino' ... and you may have spotted Tatis rockin' the ice during the Home Run Derby in Denver on Monday -- and the jewelry is amazing.
TMZ Sports has learned that the pendant -- featuring a little boy's face -- is filled with 25 carats of VVS emerald diamonds ... and the specially made Hermes chain holds 75 carats of VVS diamonds!