Piaget’s Hidden Treasures watch with a turquoise dial. First, the rough is sliced into squares so that brands or their dial makers can use templates to determine how best to cut slices for dials.

Elsewhere, Cartier’s elongated oval-shaped Baignoire watch has a mesmerizing, hypnotic dial featuring an irregular mosaic of mother-of-pearl, turquoise, and onyx stones.

Colorful mood-boosters 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 from an ...

From Chopard to Piaget, brands are releasing colorful hard-stone dials that channel the flamboyant spirit of the 1970s and work as quick mood boosters.