How to approach someone wanting a necklace similar to your collar?

My D-Type and I are visiting his family this week for a wedding. We were out for dinner last night and his mother noticed my day collar, which is a triple o-ring necklace with customizable colors from Captive Collars. She took a liking to it and asked where I got it -- somehow my D-Type's brother either knew what it was or was just making a "nunya" joke, but he thankfully was able to deflect her. She brought it up again today, however, and it is clear that she wants something similar. My D-Type tried to subtly explain that it was more of a couple's thing, which she obviously didn't understand since she does not know what o-ring jewelry represents.

I am absolutely not comfortable outing ourselves as kinksters to her over a day collar, but she is a persistent person by nature so I know that this will be brought up again. Does anyone know of any minimalist/subtle neckaces with customizable colors that are NOT BDSM related? I am also not fond of us getting something for her from Captive Collars and pretending that it is not related to kink. The idea weirds me out.