53x18mm oxidized brass bookmark with a 18x13mm stone. Choose one of 16 stone cabochons on a silver or brass bookmark: Snowflake Obsidian Tree Agate Unakite Aventurine Sodalite Soft Russian Serpentine Sodalite Dark Blue Howlite White Howlite Black Onyx Tigereye Goldstone Carnelian Mahogany Obsidian Rose Quartz Rhodonite Be sure to search my shop for other matching stone jewelry. For other aventurine items check out this listing: https://www.etsy.com/listing/1027169859/aventurine-stone-vintage-style-necklaces