The faceted “gemstones” in these containers are captive, meaning that once printed they rotate freely within the wall.
See here for video: https://youtu.be/U29BH97z4Jc
This design is particularly suited to printing with multicolour filament as rotating the gemstones allows for visualization of the different filament colours.
This model features the tricolour “Silk Red & Yellow & Blue” filament by Eryone.
Once printed, allow the print to cool. Wiggle each gem back and forth until it breaks from the small internal supports. Twist it a few times until it turns smoothly.
See here for other “Captive Gemstone Containers” in the series:
Small: https://social.thangs.com/m/456538 Medium: https://social.thangs.com/m/456558 Large: https://social.thangs.com/m/456581