A few of my personal pieces of jewelry.
In English speaking jurisdictions the Square and Compasses are often depicted with the letter "G" in the center. The letter is interpreted to represent different words jurisdiction to jurisdiction. Among the most widely accepted interpretations are that: [G] stands for God, and is to remind Masons that God is at the center of Freemasonry. In this context it can also stand for Great Architect of the Universe (a reference to God). In a different context, the letter stands for Geometry, described as being the "noblest of sciences", and "the basis upon which the superstructure of Freemasonry is erected.
The skull and cross bones represents the mortality of man; in this context, it is found on older crucifixes and is to remind us of our ultimate end and the importance of living a life under moral law.