What do the letters ADL 14k mean in reference to a diamond ring?

My friend found an old ring of his mothers and was wondering what ADL meant..maybe something to do with the diamond itself?|||hmmm... i'm not 100% sure but usually reputable jewelry stores engrave the inside of the bands. ADL would stand for the store (if im correct) and the 14k has to do with the ring (purity of gold), not the diamond|||ADL is the hallmark of the manufacturer - it has nothing to do with the stone(s)