What is the necklace that Mirajane wears around her neck? In Fairy Tail when Mirajane isn't in her Satans Soul form and she looks like this in the picture below-



I notice that she wears some type of necklace around her neck. What/is there a sentimental reason/value behind why she carries around this necklace on her neck?

Here are some other examples...



and another here...



Answers are appreciated. :)
I was unable to find any in canon references from official sources but based on general opinion here it appears to be used for general decoration and serves no exact purpose.

There are no exact references on the necklace, so this would be the most likely answer at this time, since no new information has been released yet.