It's called a conservation piece .
Looks like a mini carboy/ garden bottle to hold a bit of something like an air plant ?
Just found this on Amazon
Sponsored
Mkouo 2 Pack Glass Hanging Plant Terrarium Flower Vase Planter Air Plant Pot Container Home Decoration, Orb and Teardrop
Mkouo-Terrarium-Container-Decoration-Teardrop/dp/B01DXVZQSI/ref=sr_1_24_sspa?keywords=small+glass+plant+bottles&qid=1560461278&s=gateway&sr=8-24-spons&psc=1