Interesting. So 'chiral' is another word for 'handedness' - your hands are chiral, in that you can't rotate your left hand in such a way that it looks like your right hand (yes I know what the Greek word for 'hand' is).

So I assumed that these would be gold atoms with a chiral molecule around them - the ligand, that is. However, from a quick search it appears that there are these gold nanoparticles that are chiral shapes. In other words, the structure of the particle is chiral, not the molecule itself.

In any case, I doubt you can get them over the counter any time soon, but who knows.

edit: Here is a nice looking review that is free to read : https://www.nature.com/articles/s44222-022-00014-4

Seems like there are a variety of different techniques but Figure 2d in that review shows an image referencing - 'Lee, H.-E. et al. Amino-acid- and peptide-directed synthesis of chiral plasmonic gold nanoparticles. Nature 556, 360–365 (2018)'