if thats the case you need to do two things, one, make sure your computer is calibrated. i dont know how to do this for your computer but if you know a techy person they might help you . because this
https://www.etsy.com/listing/158146946/white-leather-bracelet-with-gold-studs?ref=teams_postlooks blue at first glance,
but when i looked more closely, i think you might be using more than one kind of light. like daylight and incandescent light at the same time. this will really mess up your light.
use only one kind of light. if you are using daylight, turn off all the lights in the area. if you are using incandescent light, do the shots at night or block of the daylight.
finally, it looks like there is a problem with your screen or your camera or both, it doesnt matter if its white in person if it looks blue to the buyer.
one thing i think you need is a white balance card: they run $3-$15
http://www.bhphotovideo.com/c/product/788272-REG/Vello_WB_CS_White_Balance_Card_Set.htmlthis premium one has a white, black and grey card together. the way this works is that most cameras except for cell phone cams and the least expensive ones (-$100) allow you to take a picture of something white or gray and set that as the default white, this will help your camera understand this is white so when you take a picture white looks white and not blue or yellow or anything else.
you dont NEED a white card, but if you dont have one you must take care to use only one type of light. and block out all other kinds.