[There are no affiliate links in this post and I haven't been paid by anyone; I just happened to have bought the charms from Shein. You can probably get similar things on Temu, Aliexpress or Amazon]

I made a  cute LessWrong themed necklace/earring set for cheap, here's how.

For the necklace, buy a pair of these earrings from Shein:

US: https://us.shein.com/1pair-Fashionable-Rhinestone-Star-Decor-Drop-Earrings-For-Women-For-Daily-Decoration-p-15276285.html 

CAN: https://ca.shein.com/1pair-Fashionable-Rhinestone-Star-Decor-Drop-Earrings-For-Women-For-Daily-Decoration-p-15276285.html. 

Then remove the dangly charm and use a wire to attach it to a necklace chain. 

(I bought a cheap necklace from Shein to use as the chain but it tarnished within days. Amazon seems to sell decent chains/necklaces for ~20$, but I haven't bought any so can't personally recommend them (I used an old chain from my grandmother instead). If you're buying a necklace make sure any pre-existing charms can be removed.

You can either get two pairs of the above earrings to make a set, or get these ones if you prefer studs:

US: https://us.shein.com/1pair-S999-Sterling-Silver-Cubic-Zirconia-Eight-pointed-Star-Design-Symmetric-Earrings-For-Women-p-23036383.html 

CAN: https://ca.shein.com/1pair-S999-Sterling-Silver-Cubic-Zirconia-Eight-pointed-Star-Design-Symmetric-Earrings-For-Women-p-23036383.html 

Here they all are together:

Note the stud is quite small. Here is what it looks like on my ear, in comparison with the hoop earrings: