Masonic Rings – 23k Gold plated 925 Sterling Silver Black Onyx Third degree Masonic “Master Mason” Blue Lodge Ring The top of the Mason Ring features the Square and Compass Masonic Symbol on the onyx stone and the plum and trowel symbols on the sides. A lovely antique finish completes the ring. Solid .925 sterling silver is plated with 23k gold to create this vermeil design. This is a solid back ring for added comfort and weight.