In traditional astrology and gemstone lore, a red coral ring is often recommended for promoting marital happiness and harmony. However, it's important to clarify that red coral is not a metal; it is a type of gemstone or organic material derived from the skeletons of marine creatures.
For a red coral ring, the metal used for the setting would depend on personal preference and cultural customs. Commonly used metals for gemstone settings include gold (both yellow and white gold), silver, platinum, and even copper. These metals can provide a beautiful contrast to the red coral and complement its vibrant color.
Ultimately, the choice of metal should be based on factors such as personal style, skin tone, budget, and durability. The red coral gemstone itself is believed to possess beneficial energies that can promote love, marital harmony, and general well-being. However, it's essential to approach such beliefs with an open mind and consider the cultural and spiritual significance that might be attached to the gemstone in different traditions.