Sterling Silver 925 coral ring signed

Brutalist Modernist Sterling Silver Ring featuring a red coral cabochon, and it is signed by an artisan with the initials "MT". The "sterling" stamp indicates the silver purity of 92.5%, as is standard for sterling silver.
Key details about the ring:
Style: It embodies a Brutalist or Modernist design, characterized by its abstract, biomorphic form and textured silver work, which often includes intentional black patina in recesses to enhance the design.
Material and Gemstone: The ring is crafted from sterling silver and features a polished, oval-shaped cabochon of natural red coral.
Maker's Mark: The "MT" signature is the maker's mark, or artisan's signature, indicating the individual or firm responsible for its creation. While the specific artisan "MT" is not fully identified in the provided searches, their mark is consistently associated with this type of modernist sterling and coral jewelry.
Era: Similar rings with the "MT" signature and Brutalist