I've owned Ruby, Lapis in various iterations, Diamond, and for the past many years, Niagara and Sky. Diamond was very transparent and fast, more open sounding than Lapis, and with a wider frequency response range, but I did notice that electronic sheen or edge sometimes. If proof is in the pudding, I sold off my several pairs over time but ended up keeping a pair of late-edition Lapis, which had a more fleshed out and honest midrange I thought. I keep the Lapis as a tester backup and have had Sky and Niagara in my system for many years now (and Dragon for the speakers).
