Baseball, Gems or Playing Cards? Mystery Cache

If you check the dictionary, there are only four definitions for the word diamond...the stone, the shape, the suit in playing cards and the baseball field. There are some diamonds in this cache, but they aren't really any of the above definitions. Although, technically, they meet the "shape" definition. 

This is a two-stage cache. To find this cache you are required to go to the listed coordinates and use a Garmin CHIRP-enabled device to retrieve the final cache location. There is parking nearby at stage one. The second (and final) stage is where the log is. It is roughly a mile away from stage one, as the crow flies.