Singular jewels that will sparkle on camera, including two convertible pieces — a necklace turned headband and a ring from a bracelet.

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. Ashley Madekwe is a fan of the brand; price upon request, special order at Dior, New York and Beverly Hills and dior.com.

 

Chopard

From Chopard’s Red Carpet Collection, a 13.69-carat pear-shaped diamond is flanked by 53.04 carats of pear-shaped rubies on a necklace of white and rose Fairmined gold. Andra Day wore Chopard at Critics Choice; price upon request, at Chopard, New York and Beverly Hills and chopard.com.

 

Messika Paris

The Heart Shaped Single Hoop earring features a 5.08-carat heart-shaped diamond set on diamond-embellished yellow gold; price upon request, at Messika Century City and messika.com.

 

Chaumet

A Colombian emerald totaling 7.29 carats is highlighted by baguette-cut diamonds set in yellow gold on this Skyline ring from the Perspectives de Chaumet high-jewelry collection. Gal Gadot has worn Chaumet; price upon request, chaumet.com.

 

Tiffany & Co.

The jeweler’s 2021 Blue Book Collection includes this platinum and yellow-gold bracelet with an 11-carat unenhanced yellow sapphire at its center, surrounded by baguette-cut diamonds. Anya Taylor-Joy wore the brand at the SAG Awards; price upon request, at Tiffany & Co., New York and Beverly Hills and tiffany.com.

 

Van Cleef & Arpels

Framed by lapis lazuli, the 8.03-carat cushion-cut diamond on this Expansion bracelet of diamonds and sapphires can be removed and worn separately as a ring; price upon request, at Van Cleef & Arpels, New York and Beverly Hills and vancleefarpels.com.