What is the importance of Jane and Nicholas' wedding rings in the novel, Almost Paradise?

Jane and Nicholas buy wedding rings from a department store the day they marry, three months ahead of schedule. Over the years, Nicholas buys Jane many new wedding rings that are more expensive than the original, but it is the original ring Jane is wearing when Nicholas sees her in the hospital in London after her accident. Nicholas immediately asks Murray to retrieve his, which is hidden in a wooden box where he keeps his cufflinks.