| Antique | Yes |
| Occasion | Anniversary, Birthday |
| Main Stone Color | Black |
| Metal | Yellow Gold |
| Secondary Stone | Diamond |
| Jewelry Department | Fine |
| Main Stone | Onyx |
| Vintage | Yes |
| Main Stone Treatment | Not Enhanced |
| Department | Women |
| Main Stone Shape | Oval |
| Style | Cocktail |
| Base Metal | Gold |
| Gemstone Clarity Grade | Eye Clean |
| Main Stone Creation | Natural |
| Signed | Yes |
| Color | Gold |
| Sizable | Yes |
| Material | Gemstone |
| Materials Sourced From | United States |
| Setting Style | Prong |
| Diamond Clarity Grade | Flawless (FL) |
| Type | Ring |
| Metal Purity | 10k |
| Era | Art Deco (1915-1935) |
| Original/Reproduction | Original |
| Theme | Beauty |
Up for sale is an authentic, beautifully preserved vintage estate cocktail ring manufactured by the historic Plainville Stock Company (PSCO). This stunning Art Deco style ring features a large, polished oval cabochon black onyx center stone. Set directly into the heart of the onyx is a white gold, diamond-shaped plaque showcasing a single-cut sparkling diamond accent. The mounting is a spectacular example of Mid-Century craftsmanship, boasting a highly detailed yellow gold filigree and scroll openwork setting. Maker's Mark: Stamped "10K" alongside the official "PSCO" hallmark. Ring Size: 7 Weight: 4 grams Condition: Excellent vintage condition with normal light wear consistent with age. No cracks to the onyx or anywhere else.