The Innobaby TEETHIN' Smart Birthstone Ring Teether in December (Blue Topaz) is a silicone teething toy suitable for babies as young as 3 months. It is designed to be safe for babies with materials that are PVC, BPA, phthalate, latex, and lead-free. The toy features a birthstone theme with a blue color, making it visually appealing for parents. Additionally, it is dishwasher safe for easy cleaning and maintenance. This teether is a unisex product that does not require batteries, making it convenient for parents to use.