Why this title? For some, the turn of phrase makes no sense, for others—for people familiar with tools, and most commonly for stonemasons and sculptors—the phrase is both a noun and a verb. Here we are only referencing the verb, we are only interested in the process.
Definition:
Dressing stone is defined as the process of giving a proper size, shape and finish to the roughly broken stones as obtained from a quarry.
Definition as used in the novel’s title:
Dressing Stone is defined as the process of ultimately obtaining a proper size, shape and finish to the protagonist’s broken hearts as obtained from the quarry of a roughly managed or ill fated lovelife.