If you like it, and not wear it for some magic - why not?
Our scriptures tell us to not adorn ourselves with costly array. Jewelry in itself is for style, pride, or boast. It's an accessory of the flesh.
I would not say glass jewelry is costly.
Some of it goes upwards of $298. But you are right, some of it is "cheaper". If you consider even the cheaper $20 stuff is a lot money in 3rd world countries (considering it is an accessory). However the concept of jewelry works somewhat against the concepts taught in the New Covenant. It's worldliness, it's pride, it's boast, and style to "fit in", etc. The scriptures speak of meekness, humbleness, modesty, etc. To stand out, wearing items of fashion, boast, and pride, seems to work against the "Christian Motif".
I believe the intent of the OP was also about "Evil Eye" which of course the jewelry has a bunch of eyes (or one). I am not sure if they were intending on bringing in a masonic "all seeing eye" issue. (Eye of Horus) I don't know if the jewelry intended for this interpretation. But I can state that outward fashion, prideful things, "worldly things", and costly array work against the New Covenant.