Stamped 18k. It is unlikely to cause allergic reactions to metal or rust, so you can wear it with peace of mind. Butterflies symbolize "beauty," "growth," "transformation," and "rebirth" from the way they evolve from larvae to adults. Also, the way they flutter and fly away gives them meanings such as "ascent" and "leap." From this point, the butterfly is a recommended motif for those who "want to become a new self" or "want to move up a rank at work" ❤︎ Thank you for your understanding. Decoration: Shell Material: Gold Color: Gold