These domed resin cabochon stitch markers are dark blue, with opalescent and gold foil mixed through them. Each one is different, and each one is beautiful.
Gold colour setting, leverback fastening.
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.