What does 18k Meg esp stamped in a ring mean?

The marking "18k" indicates that the ring is made of 18 karat gold, which means it contains 75% gold and 25% other metals. "Meg esp" likely refers to the designer or manufacturer of the ring, though it may not be widely recognized. The combination of these stamps signifies both the quality of the gold and the craftsmanship or brand associated with the piece.