*I forgot to mention in the video the last step, which is to change button material type to 'Silk/Satin'. It will give you that 'pearly' look. :)*
These tips that I share are meant to be used for visualizations in CLO. I don't know how using these tips would affect the necklace once it is exported from CLO and simulated in other software. Even if the simulations are good in CLO, doesn't mean they will work the same way in other software. Please be mindful about the application of these tips depending on the context of your work.
Many thanks!