 How does the monster wearing the diamond ring send a different message than the main character's wife wearing the same ring?
Images began to appear, drawn from inexhaustible files, wherein are kept all thoughts, past, present, and future.... "Oh, a ring, and it's a diamond, too!" "It's for you; so long as you wear it, I'll come back, even from the dead, if need be. She held the ring up to the light and read aloud, "It is forever." She took off the locket she wore about her neck and held it up to the shimmering light, letting it spin at the end of its chain. It caught the shadows of the fire and reflected them, greatly magnified, over the room. It was in the shape of a star, encrusted with emeralds, with one large ruby in the center. When he opened it, he found a picture of her in one side, and in the other a picture of the children. His cold fingers found the locket, making a little bulge under his uniform, and the touch of it seemed to warm the blood in his veins. Three days later they had landed in Spain, merged with another division, then crossed the Pyrenees into France, and finally to Paris where the fighting had begun. The Russians had not yet used the H-bomb; the threat of annihilation by the retaliation forces had been too great. The very feel of the word was everything a battle-weary soldier needed to make him fight harder and live longer. When the all-clear had sounded, the men clambered from their shelters.
 The ring is meaningless now that it is not worn by his wife.
 The ring now shows that material love is stronger than emotional love.  The ring is meaningless now that it is not worn by his wife.  The ring now shows that anyone can hold a symbol of love.  The ring shows that the love between the main character and his wife was not exclusive between them.