18. Jessica Biel and Justin Timberlake

Justin Timberlake proposed in 2011 while on holiday in Montana with an 18-carat white gold and black rhodium plated ring, featuring two aquamarines on each side.
Warning: include_once(/opt/www/ireland.la/wp-content/themes/generatepress_child/ads-essentials.php): failed to open stream: Permission denied in /opt/www/ireland.la/wp-content/themes/generatepress_child/ads.php on line 12 Warning: include_once(): Failed opening '/opt/www/ireland.la/wp-content/themes/generatepress_child/ads-essentials.php' for inclusion (include_path='.:/usr/local/lib/php') in /opt/www/ireland.la/wp-content/themes/generatepress_child/ads.php on line 12

Justin Timberlake proposed in 2011 while on holiday in Montana with an 18-carat white gold and black rhodium plated ring, featuring two aquamarines on each side.