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This is a James/Lily called Silver.
When Severus called her a mudblood in their fifth year, she began to despise the color silver. She couldn't hate green because it was the color of her eyes. Whenever she saw silver, though, it left a bad taste in her mouth and in her mind.
When James proposed to her, she was nervous as he took the ring out of its box. She had never mentioned her aversion to the most popular engagement ring metal. She didn't want the memory to be tainted with the bad feelings that came with silver.
She really had nothing to worry about, though, because even though she had never mentioned it, he knew. He saw the change in her eyes whenever the color was near. So, of course, her ring was truly Gryffindor, through and through. The gold band highlighted the red ruby well. Even though she always believed it to be a coincidence, he knew the truth. He knew her better than she knew herself.