A pre-mounted engagement ring is a diamond or precious gemstone engagement ring where the center diamond and other stones are already set in place. The diamond and setting have been previously selected with a preset engagement ring, meaning the ring is assembled and ready to go. This means there's less wait time. Browse Shane Co.’s assortment of pre-mounted bridal rings, all set with ethically sourced diamonds and gemstones. We offer preset engagement rings in a variety of popular styles, including halo rings, three-stone styles, rings with colorful accents and unique vintage engagement rings. You can also filter our preset engagement rings online by price range to find something that matches both your style and your budget.