blue marble NATIONAL GEOGRAPHIC Gemstone Advent Calendar - 2025 Christmas Countdown Calendar for Kids with 24 Gems to Open Each Day, Complete Rock Collection with Mini Gemstone Dig Kit Gemstone Collection is up for auction in Toys & Games. The current bid is $3.50, 81% below the $17.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.