Ametrine is an unusual natural combination of Citrine and Amethyst. During formation if the temperature is above 500°C then Citrine is formed - but below 500° sees Amethyst created. If the Temperature is fluctuating around 500° you can find Amethyst and Citrine layered together in one Crystal.
Energetically these are perfect partners. The spiritual purifying balancing qualities of Amethyst combine with the more grounding mental clarity and activating nature of Citrine to create a state of relaxed creative mental focus which also helps difficult decision making.