This is actually an antique brooch or pin with an old-time trombone clasp. It is a calligraphy style Letter M that is cut out and has diamond cut intricate designs. It is jeweled with three prong set genuine rubies. This is a designer piece and is marked on a raised cartouche on the back “400VI FIBO750” It is solid 18 karat yellow gold and designer signed. Measurements: 2” x 1.25” Weight: 3.43 g Condition: Great No offers below my asking price please.