Gem Stone King via eBay takes up to 80% off select women's engagement rings and men's and women's wedding bands, with deals starting from $16.99. Plus, all orders qualify for free shipping. That's the first such sale we've seen from Gem Stone King, which yields a number of price lows. Sale ends February 8 at 11 am ET.

A best bet is this Women's 0.2-tcw White Gold Solitaire Engagement Ring (pictured) for $219.99 with free shipping. That's the lowest total price we could find for a similar ring by $128. It's available in sizes 5 to 9.