Tiffany & Co. has been selling the women’s solitaire diamond engagement ring since 1886. It only took 135 years for men to get their own version.

Say “Guy do!” Set in manly platinum or titanium, the new line of men’s engagement rings from Tiffany & Co. is designed for natty grooms-to-be.

An Apple Ring could feature an expandable design, one that can extend the length of the ring to make it into a finger-sized tube, allowing it to employ more sensors and perform other functions ...