This jewelry features flowers or scenes under glass. The pins are usually framed in brass or nickel silver. Some of the finer ones are sterling and some are bakelite. The backgrounds can be thin metallic foil paper (typical) or mother of pearl (older). I seldom find these pins in excellent condition. Generally, they are cheaply made and were never meant to outlive their original owners. Butterfly wing jewelry is similar and has domed glass that is often reverse painted by hand. Actual wings from butterflies are used as the backgrounds. The last pictures in this album are butterfly wing pins.