Ametrine "GEM-INTRUSION” technique consists of precisely inserting solid colored gemstones into a faceted and carved transparent host gem. The result is a play of colors like a visual kaleidoscope, a gem with internal "fireworks".
Gem quality sphalerite is a rare collector stone. The mineral is usually nearly black in color but is occasionally found in transparent pieces of an orange or yellowish brown hue. Clean pieces are extremely rare.