Ruby eternity rings make an ideal anniversary gift for several reasons. Firstly, ruby represents love and passion. Secondly, the never-ending circle of diamonds symbolizes the unending commitment between partners. Thirdly, ruby is a timeless gemstone that will never go out of style. Fourthly, eternity rings are a classic and elegant style of ring. Finally, the sentimental and meaningful nature of an eternity ring makes it a cherished and significant gift for any anniversary.