Listings show rainbow bookends are commonly made from natural stone (marble) and wood-based materials such as pine and MDF.
Dimensions vary by model; typical ranges in the listings are heights of about 6–7 inches, widths of about 3.0–6.5 inches, and depths of about 2–5 inches.
Most rainbow bookend options are sold as a set of two decorative bookends.
Common finishes include white marble and pastel-painted wood. Pastel color options listed include blue, green, yellow, and pink.
Listings describe them as suitable for home offices, living rooms, and libraries as well as children's rooms and playrooms, fitting both modern/minimal and kid-friendly decor.
Common design details include layered or smooth arcs forming a curved rainbow silhouette. Some marble options are described as sculptural and non-slip.
Marble options are described as handcrafted or expertly carved from genuine marble, with natural veining that makes each piece unique.
They’re described as charming, pastel-colored accents that brighten kids' rooms or playrooms while keeping books organized and accessible; reviews note a cute appearance suitable for nurseries.