A rare Edwardian-era treasure, this antique engagement ring features a 5.04 carat old mine cut diamond certified by GIA, showcasing warm K color and I1 clarity. Surrounded by 16 old mine cut accent diamonds totaling approximately 0.60 carats, the ring is crafted in a combination of 18k yellow gold and platinum. Its delicate milgrain details and romantic proportions reflect the refined elegance of the early 20th century. Circa 1910s, size 6.5.