The best way to celebrate a woman of beauty and substance on Valentine’s Day is with a gift that has those same qualities. A luxury watch hits just right, preferably one that straddles the line between tradition and modernity—a timeless design, but with a modern twist; and state-of-the-art chronometry but scaled to a woman’s wrist. It’s a tall order, but the ladies’ watch segment has been up to the task lately, as the 10 watches in this gift guide illustrate. They prove it’s possible to be technically sophisticated, beautiful and sized to fit, with a dash of investment potential all in one package. Their makers understood the assignment. That said, two of these watches are technically men’s models, so they’re sized a little bigger than the rest, but we love them anyway because they’re stylish and classic. Vacheron Constantin Traditionelle 33 The 33 mm Traditionelle is the sized-for-women version of Vacheron’s classic..