Vintage 18ct Gold and Platinum Solitaire Diamond Engagement Ring

This is a vintage solitaire engagement ring featuring a round brilliant-cut or potentially old European-cut diamond. The ring is constructed with a dual-metal design typical of the mid-20th century. The main shank of the ring is crafted from 18ct yellow gold, which transitions into a white metal head and shoulders. The interior of the band is clearly stamped with "18ct PLAT," indicating that the band is 18k gold while the prongs and setting are made of platinum to better highlight the white color of the diamond. The diamond is secured in a classic multi-prong buttercup or crown-style illusion setting designed to make the stone appear larger. The shoulders of the ring feature decorative openwork filigree details where they meet the central setting, adding an architectural element characteristic of late Art Deco or mid-century styling. The condition shows moderate wear with some surface scratching on the metal and thinning of the band consistent with age. There appears to be a slight patina and some dirt accumulation around the prongs that could be improved with professional cleaning. The diamond's clarity and color would require a loupe for a precise grading, but it shows significant brilliance under the ambient light. This piece likely dates from the 1930s to the 1950s.