These are platinum plated with semi precious zirconia stones jewelries.
They are very high grade/quality jewelries
Like all costume jewelleries do not expose to Harsh liquids like perfumes.
Always wipe out body residues after each wear. And store them in a nice dry place
They will last Several years.
They are nickel and lead free so they should not cause skin reactions
Also please remember they are occasional jewelries. Not an everyday wear.