Geodes: Collectors know it’s what’s on the inside that counts

This citrine geode from the Rio Grande do Sul in Brazil sold for $5,000 plus the buyer’s premium in May 2018 at Heritage Auctions. Image courtesy of Heritage Auctions and LiveAuctioneers.
NEW YORK — The latest trend in home decorating involves objects that are thousands and sometimes millions of years old. Geodes — rocks that contain crystals — are all the rage as home accent pieces. While hunting for geodes is an established pastime, the alluring natural history specimens are readily available at auction.