Gold Nugget Decomposed Granite Southern California quarry material shipped bulk throughout Southern and Central California and SuperEarth-sacks as everywhere. Gold Nugget Decomposed Granite has the most amount of DG and highest quartz content of any of the tan to gold decomposed granite and "D. G." materials quarried in Southern California. 3/8" Gold quartz pebbles with black speckles result in a more uniform application and finished look than Pyrite Gold and for a really beautiful golden brown landscape.