I asked my partner Peter what I should describe these as - he came up with 'multicoloured magic trinkets', and I quite liked it.
These are faceted resin cabochons, featuring blue, green and pink (amongst other colours!) and change in every light.
Silver colour setting, leverback fastening. Also available in a gold setting, with more greens and orange.
Listing is for one marker.
As always, colours may vary based on the colour settings on your device, though I don't apply colour changing effects to my photos, so hopefully you'd be as pleased, or more, with it in real life.