| Main Stone Creation | Natural |
| Shape | Butterfly |
| Color | Black |
| Cut Grade | Good |
| Main Stone Color | Black |
| Material | Stone |
| Metal | Sterling Silver |
| Item Length | 2-1/2 |
| Secondary Stone | Marcasite |
| Main Stone | Black Onyx |
| Vintage | Yes |
| Brand | Onyx |
| Setting Style | Bezel |
| Main Stone Treatment | Unknown |
| Type | Brooch |
| Metal Purity | 925 |
| Main Stone Shape | Oval |
| Base Metal | Silver |
Gorgeous vintage black onyx and marcasite brooch. 2-1/2in long The black onyx stone is right under 1 inch height x 3/4in wide