Golden Sierra Quartz Boulders Golden Sierra Quartz Boulders are also known as Autumn Gold Boulders and Rusted Quartz Boulders. Central California quarry producing a wide range of rock material from the rubble to large boulders. Golden Sierra Quartz Boulders are a richly colored combination of gold and fall harvest orange and brown color tones another great name would have Fall Harvest boulders) very hard white quartz rock that is the perfect medium for these beautiful and gold colors. These boulders, whether small or large will contrast greatly with native grasses, bold flower perennials, and groundcovers. Rock material is available in 12 inches through 60-inch sizes, most commonly 24 to 36 inch. Materials are shipped bulked 18 to 24 tons throughout California. Smaller orders shipped on pallets anywhere requested.