Also called a blue velvet damsel. Gets quite large and gets progressively more aggressive as it gets larger. If your wife is interested in something similar to those colors, take a look at the false springer damsels instead. They're usually mixed in with regular springers since they're collected together, but it's pretty easy to tell them apart. It's an undescribed species at the moment, but they're about as docile as I've ever seen any fish. I have a pair in the tank and they leave each other and every other fish alone.
Don't have a picture of mine currently, but this is what they typically look like, a mixture of blue and black.