Handmade and signed by Kathy Seff, Glass Artist at Colorful Visions Glass Art Studio. Classic powder blue with a pattern fired into the glass that is reminiscent of Mondrian's Broadway Boogie Woogie (the artists favorite). Although Mondrian would not approve of the shade of blue, bah humbug! Adjustable sterling silver base for perfect fit. Measures appx 1/2" square. Packed in blue gift box ready for wearing or giving!