needed a base for a 43mm purple amethyst. 2 peice design captures the crystal so that it doesnt fall out secured by a screw. example here https://www.gemrockauctions.com/auctions/43mm-blue-dumortierite-quartz-crystal-sphere-ball-peru-stdm-pa323-789204 https://store.lightworkstones.com/listing/624799427/glorious-43mm-clear-quartz-crystal https://www.ebay.co.uk/itm/Quartz-Crystal-Ball-Gemstone-Sphere-43mm-109-Grams-QS1803-/282849639490

ebay has a selection of 43mm crystals

borrowed the little dragon from here.all credit for the dragon goes to Sebastian_v650 https://www.thingiverse.com/thing:1624412