VTG 925 Sterling Silver Agate Cabochon Ring Pear Shape Polished Rock Southwest

Estate-find vintage cocktail / statement ring, marked "925" on the back.  Handmade?

The stone (agate?) is teardrop / pear shape and measures approximately 30mm long x 20mm at the widest. Polished smooth. Bezel setting with "dot" border.

The silver border measures approximately 40mm long x 30mm at the widest.

The band measures at approximately size 10.

Weighs approximately 14g on my kitchen scale.

Unsigned, but marked "925" on the back.

Pre-owned. Tarnished. Needs to be cleaned & polished by the Buyer.