This is a vintage later 20th century, hand crafted ring that was produced by an artisan jewelry maker. It may be hand casted or wax resist jeweler's silver with a pearl embedded in the design. Jeweler's silver is usually not 925 or sterling. The pearl should be 'bite' tested to determine if it is genuine or simulated. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.