Wow, this engagement ring set is absolutely stunning! It features a 12x6 mm marquise lab-created emerald that's just brilliant, plus 0.30 carat of round black diamonds that add this gorgeous contrast. The black diamonds are natural but they've been treated with HPHT (high pressure heat treatment) to get that deep black color - it's permanent and completely safe. The setting is black rhodium plated 18K white gold which gives it this really sophisticated look. Just so you know, the black diamonds might have some small chips or white spots since they're semi-faceted, but that's part of their natural character. It comes with a nice jewelry box too, making it perfect for proposals or anniversaries. They offer a 90-day warranty where they'll fix any stones that fall out during normal wear for free. Seriously, if you're looking for something unique that stands out from traditional diamond rings, this set is definitely worth considering. The combination of green emerald and black diamonds is just so eye-catching and elegant.