Brantley Gilbert had quite a rock in his pocket when he proposed to fiancé Jana Kramer Sunday on the stage of Nashville's Ryman Auditorium.  

According to People , Brantley worked with Giador Fine Jewelry in Music City to design the custom five-carat diamond ring for Jana.  She says, "I'm in love with it.  I can't stop looking at it!"

The diamond is round-cut and set in white gold with diamonds embedded in the band.  Brantley and Jana have been dating for about a year now.  No wedding date has been announced yet.

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