This is a locking Jewelry box that looks like a stone. The printed ones I've done glow in the dark. To unlock, hold upside down and start sliding the lid and rotate back to normal and continue sliding. Update - I will also be putting out a second version with a better locking pin.

Update.. Non locking version at: https://www.thingiverse.com/thing:2896380

Enjoy..

Sherm

Also now a Matching LAMP !! https://www.thingiverse.com/thing:2892093