Natural Congo Citrine: Kundalini Quartz - Ethically Mined Twin CrystalEthically hand mined in the Democratic Republic of the Congo 40mm ~ 1 1 2" ~ 36 grams The largest crystal of this beautifully formed Twin is a Transmitter (7 3 7 sides) with rainbows. Very good condition. Most 'citrine' is heat treated Amethyst. This crystal is guaranteed to be natural Citrine, with the same colour as when it was hand mined. All Congo Citrine has a few dings, as shown in the images. "Citrine is one of the two minerals on the planet