All jewellery should be kept away from the sun, water, perfumes, suncreams, fake tans, nail varnish removers and body creams and small children pulling them :-D.
To prolong the life of your jewels and to keep them looking beautiful and shiny as they should be to ensure that they last for a very long time... please do not shower, swim or sunbathe whilst wearing them.
Spraying strong perfumes and creams/suncreams directly on to your jewellery should be avoided as this will cause them to tarnish and with bead necklaces this could weaken the thread that they are strung on to and also damage the beads and cause the coating to be damaged.
Remember that although your Razorblade Mermaid item is a carefully handmade item, it is still a fragile piece of costume jewellery and should be treasured.