When my now-husband and I got engaged, I was shocked to find out my engagement ring — with its gorgeous platinum band and near-flawless shimmering cushion-cut diamond center stone — was from Costco, the same place we get our rotisserie chickens and athleisure wear. However, I was even more taken aback when it was appraised for a third more than its initial cost. That member testimonial — published in the Costco Connection magazine — is the story that the jewelry community cit