Few stones inspire thoughts of summer quite like turquoise, offered in vivid hues ranging from a clear, pale blue sky to a robin’s egg tone or a deep azure that conjures images of Caribbean waters.

It’s that age-old question: why choose a turquoise bib when you could a diamond necklace? Eva Mendes, Rachel Zoe, and the Van Cleef archive hold the answers. In the annals of red-carpet jewelry ...

The lack of a grading system for the popular stone has prompted a father-son team to spend the last five years working on one. Turquoise stones from the blue and green master sets at the Turquoise ...