They are real mined diamonds. Blue ones are generally blue from being irradiated by jewelers. As for being lab made, lab made real diamonds are more expensive than mined ones. I have no indication that these are lab made/perfect diamonds, but instead they are mined irradiated ones.
Good for you. I think most jewels are the reverse to diamons because they are easier to make in the lab. Stuff like sapphires and rubies are relatively easy to flawlessly make in the lab and the natural ones are hard to find and more expensive. They even make watch crystals out of clear lab made sapphires and the fingerprint detecting button on some iPhones is a man made sapphire.