The Masonic Ring and the symbols on it is a probably the most recognizable emblem of the world's largest fraternity - The Freemasons.
Most commonly, the Masonic Ring has a symbol with a compass and square on the top. If the ring has a stone, it is typically either a blue spinel, synthetic ruby or black onyx. There are at least a couple of opinions as to whether the wearer of the Masonic Ring should wear the ring with the points of the compass either facing towards the wearer or away from them. The square is the symbol of all earthly, the compass is symbolic of heavenly perfection.
In a combined emblem:
 – The ends of the square point up as a symbol of man's aspirations toward God
 – The points of the compass point down to represent heavenly qualities coming down from God to earth.
It seems that the proper way to wear the Masonic Ring would be that in which its symbolism is best expressed - when the hand is held in its usual position the points of the compass are to the earth and away from the wearer's eyes. 
To wear the Masonic Ring, you must have achieved the degree of Master Mason.

Freemason Master Masonic Ring - Blue Lodge, Square and Compass - Silver and Gold
Handmade Master Masonic ring - Gold or Silver; Blue Lodge Masonic ring; Custom made ring; ..
Freemason Ring - Blue Lodge Masonic Ring 12 Zirconia - Silver and Gold
Handmade Masonic ring - Gold or Silver; Gemstones: Natural / Synthetic; Masons Fraternity R..
Freemason ring - Blue Lodge, Square and Compass - Silver and Gold
Handmade Master Mason ring - Gold or Silver; Blue Lodge ring – Square and Compass; Custom m..
Freemason ring - Master Mason, Square & Compass - Silver and Gold
Handmade Master Mason ring - Gold or Silver; Blue Lodge ring; Custom made ring; Hand engr..
Freemason Shriner Masonic ring - Square and Compass - Silver and Gold
Handmade Shriner Mason ring - Gold or Silver; Square and Compass ring; Custom made ring; ..
Freemason Shriner ring - Masonic Lodge ring - Silver and Gold
Handmade Shriner Mason ring - Gold or Silver; Custom made ring; Hand engraved ring; Purit..
Illuminati Masonic Ring - Eye of Providence, Skull and Bones - Silver and Gold
Handmade Masonic ring - Gold or Silver; Masonic ring with a gemstone; Custom made; Hand e..
Illuminati Ring - All-Seeing Eye, Pyramid Ring - Silver and Gold
Handmade Illuminati ring - Gold or Silver; All-Seeing Eye of Providence ring; Pyramid ring;..
Illuminati ring - Eye of Providence Ouroboros Snake - Silver and Gold
Handmade Illuminati ring; Snake Ouroboros, Eye of Providence; Custom made; Hand engr..
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