Popsugar Celebrity The Bachelorette Bachelorette Kaitlyn Bristowe's Engagement Ring | Pictures Details on the Most Expensive Engagement Ring in Bachelorette History August 1, 2015 by Nick Maslow View On One Page Photo 1 of 4 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 The platinum design features a 3.5-carat diamond. The piece is reportedly worth $150K, making it the most expensive engagement ring in Bachelorette history. Exactly 160 small diamonds surround the large round rock in the center. Previous Next Start Slideshow The BacheloretteCelebrity EngagementsEngagement Rings