Londoner Liza Urla (@gemologue) could teach a class in the art of selfies: First, it’s not all about the face; focus on your neck, wrist, or, most important, hands. Second, make the gem the star. Her feed (and corresponding blog) is a jewelry lover’s dream.     (Inset) Close-up on Spark Creations     Feeling blue at Bulgari   Rocking a Chanel backlace   A Lydia Courteille moment   Modeling Melie Jewelry   Now that’s a ring party!