These are heat treated stones that were once Amethyst. Although the energy differs from that of natural Citrine, common Citrine is still a stone many people use.
Its color ranges from yellow orange to golden brown to burnt amber. Citrine stimulates the third chakra and helps with manifestation, specifically with issues one may have around abundance and prosperity.
Known as the “merchant’s stone”, placing a Citrine in one’s cashbox has produced more income for the merchant. It not only assists the merchant in acquiring wealth but helps in maintaining it.
Citrine can help bring a vibrant, light energy into the auric field. It helps dispel heaviness of emotion or mind and enables one to perceive things in a more positive light. It can assist in releasing negative thought patterns and encouraging optimism.
Source: Love Is In the Earth, The Book of Stones