Three-stone round brilliant-cut diamond-style ring

This item appears to be a three-stone ring featuring a central round brilliant-cut colorless stone flanked by two smaller round brilliant-cut colorless stones. The setting is consistent with a white metal alloy, such as platinum or white gold, and features a bypass-style shank that curves around the side stones. The user provides unverified technical details including 'PT900' (a common hallmark for 900-grade platinum), 'D0.14' (which may refer to the side stone weight), and '0.342' (potentially a center stone weight). None of these markings are visible in the provided image for verification. The stones exhibit light dispersion (fire) under direct light, consistent with diamonds or high-quality stimulants. The piece is stylistically consistent with late 20th-century or contemporary jewelry design. The metal surfaces appear polished with minor superficial wear consistent with light use. Without physical testing or visible hallmarks, the metal composition and gemstone authenticity remain unverified hypotheses. High-degree level of craftsmanship is suggested by the prong alignment and symmetrical setting.

Based on my visual analysis of the provided images, I have examined a three-stone bypass-style ring. Based on what I can see, the piece features a central round brilliant-cut colorless stone flanked by two smaller stones in a white metal setting. Per user submission, the item is identified as containing diamonds weighing 0.342 carats (center) and 0.14 carats (sides) set in PT900 platinum. I cannot verify these specifications or the metal's purity from a photo; such details remain unverified hypotheses without physical testing. The stones exhibit dispersion and fire consistent with diamonds, but I would need a physical inspection to rule out synthetic stimulants. The setting bears characteristics consistent with late 20th-century craftsmanship, with prong alignment and symmetry suggesting a high degree of skill. This estimate assumes the stones are natural diamonds of good color and clarity and the metal is indeed platinum. If the stones are found to be natural diamonds, the value reflects current market demand for classic bridal and anniversary jewelry of this style. However, if the stones are found to be cubic zirconia, moissanite, or lab-grown, the value would decrease significantly, potentially to the $200-$400 range for the metal weight alone. To confirm these values, I recommend an in-person examination by a certified gemologist to perform a thermal conductivity test, a measurement of the stones' exact dimensions, and a chemical analysis of the metal alloy to confirm the PT900 hallmark.