Royal Pearl, named for its uniformly distributed brown-blue schiller spots on the stone surface. This type of stone is sourced from within the Shidao area of Rongcheng City, Shandong Province.

The Royal Pearl Mine primarily consists of medium to coarse-grained biotite granite, followed by a small amount of brown granite porphyry and lamprophyre. The porphyry occurs in veins, intruding into the medium to coarse-grained biotite granite with clear boundaries and a straight interface. The color is a brownish purple, and the spots within reflect a silvery blue luster in sunlight. These are very similar to imported fine coffee pearls and Royal coffee, making them ideal materials for processing both interior and exterior decorative building materials.

The Royal Pearl stone features even texture, hardness, resistance to weathering, and aesthetically pleasing colors. The compressive strength of the stone varies due to factors such as mineral composition, crystal fineness, uniformity of cementing materials, load area, load application, and the angle formed by the direction of the load and the cleavage.