Masonic ring is crafted of solid sterling silver .925 and features a 10 karat yellow gold inlaid masonic stone. Your choice of black onyx, red spinel or blue spinel. The antique-cut 14 x 12mm stone features a G, compass and set square emblem. High polished finish. Side emblems: trowel and plumb bob. Handcrafted in the USA. Ring size 10. Marked 925. This ring features a solid back (also known as johnback) and weighs a hefty 11 grams.