About a month before I purchased this, I had my ring professionally cleaned at my jeweler. Within a few weeks, the ring was already cloudy looking and I could see particles under the stone. I purchased this hoping it would save me a trip to the jeweler. I wish I had taken a before picture because it turned out amazing. Just as clean as when I had it professionally cleaned. The brush is gentle but the bristles are long and flexible enough to reach into the nooks and crannies. My emerald cut diamond easily gets grimey and doesn't reflect light as well. So I am SO happy with this purchase. It's like a new ring every time I use it.