It's so-delightful! Sodalite is a beautiful blue stone that helps bring calmness, balance emotional highs and lows, and helps to ground you.
It is not known when or where pendulum divination first developed. In the modern era, pendulums like this one are typically used by assigning an answer to a particular direction of swing or a type of movement, then asking it a question and awaiting it to take on the answering movement. Most typically this is done with a yes/no question, with "yes" being a lengthways movement, and "no" being a crossways movement, but some versions allow for multiple directions, while others may use circular movements. Some people prefer to use a pendulum mat, in which lines are drawn from the same connection point, and each assigned a possible meaning.
Pendulums are also used to measure time and to focus the mind in meditation.