Diamonds are a girl’s best friend — and so Isabelle Armstrong made the precious gems the theme of her spring bridal collection. The lineup featured geometric embroideries and layers of mixed fabrics, which created texture and beauty in each confection. Although the mermaid silhouette prevailed, there were also a few voluminous styles, most notably an intricate strapless gown with tulle petals. But Armstrong’s gowns had serious competition from several adorable flower girls, who practically stole the show.