A lot of the decent ket I was getting in 2013 when I was a daily user was racemic ket which was crystals in the shape of perfect cubes, clear-ish, maybe a little milky, but about 2-3mm long on each side. Sometimes I'd get S isomer ket which felt good and was much more trippy, but with a disappointing duration (max 30 minutes). These were needle like crystals, 5 to 10mm long but less than 1mm wide. Really sharp points and perfectly clear in colour.