This year, Piaget is also making a colorful splash with hard-stone dials. In one model from the Hidden Treasures collection, a green-hued opal dial peeks out ... sodalite and nephrite jade. Now, at ...

But, the piece with the green dial is constructed from a high-end stone, popularly known as green jade. It’s a material that goes back to the 6th and 7th centuries. Throughout history ...