Cartier From the [Sur]Naturel high-jewelry collection, a 19.13-carat cushion-shaped violet sapphire from Sri Lanka is surrounded by brilliant-cut diamonds on this necklace that also can be worn as a headband; price upon request, at Cartier, Beverly Hills and New York, and cartier.com.
Harry Winston This platinum ring showcases a 13.22-carat pear-shaped blue diamond, surrounded by 17 round and marquis-cut diamonds totaling 3.04 carats; price upon request, at Harry Winston, Beverly Hills and harrywinston.com.
Dior An emerald-cut diamond tops the RoseDior secret watch, embellishsed with pink sapphires, tsavorites and garnets set in pink and white gold.
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