Etiquette - this mysterious branch of human relations that tells us how we should behave in public - says that the watch should have the correct size for the wrist housing it, so not too big and not too small - but it doesn't specify how big or how small. In general, the watch should fit your overall style, like any other detail of your appearance. This means that it is an important element, but should not be too ostentatious or too lavish, unless you are some sort of a celebrity (hey, remember to tag us on your Instagram then!).
We can safely assert that what your watch says about your personality is truer than it sounds. You can understand a lot about people from their overall style of clothes and accessories, including bags, ties, shoes and watches.
True elegance is made of understatement: but since the image, in the end, is yours, remember that the rules of etiquette provide for some minor transgressions. And so, you have a degree of latitude about the size of your watch or its type.
After all, you would be in good company: Prince William of England never parts with his Omega Seamaster Professional quartz steel watch with bracelet, a gift from his mother, Lady Diana.