You know, you threw me a bit on this question. The candle doesn't have to violet-scented, just colored. Lavender candles are almost always violet, or at least close. I think any shade of purple will do the trick really. Supermarkets even carry candles now, so you may be able to find one blended with something so it is actually violet. But don't worry so much, just think purple. Even burning a lavender candle is soothing, to begin with. Burn it, and look into it, and repeat, I Am a Being of Violet Fire, I Am the Purity God Desires. Try to pay attention to your breathing as you do it. You can't be as nervous when you are concentrating on your breathing.
Can you paint a feature wall violet in the business? Or put a few violet plants there? Purple vibrates faster than any other color, and fast vibrations make us calmer and happier. If you want, use lavender incense.