This is a handmade resin art coaster with a distinctive scalloped, or wavy, edge design. It features a marbled pattern created using soft pastel colors like pink, blue, purple, and green, often described as an iridescent or geode style. These items are popular as decorative home accents and can be used as drink coasters. 
Key Details
Material: Typically crafted from high-quality epoxy resin.
Design: The wavy edge and swirled pastel colors are popular features of contemporary resin art pieces.
Function: It is primarily used to protect surfaces from drink condensation or heat, or simply for decoration.