Made in Europe, This Peacock Effect was originally developed in West Germany, and then expanded upon by the Czech Glass Industry starting in the 1990s. This group of thin buff top cabochons have a coating on the top surface which resembles the feathers of a peacock bird and which allows the base color to show through the design. Due to the nature of the process, not all designs are the same, Some are more blended, while others will have a sharp outline. The factories that made these cabochons do not currently produce this effect. So, these are now closeout items, all stones are sold, "as is".