It's about 55mm/2.25 inches in diameter. Note that the bears are a little more beige and the turquoise chips a little warmer than it shows here. Chinese turquoise chips, possibly colour washed, but for sure these are not dyed howlite.
$30 with a beige or black Greek leather cord on it -- or I have some deerskin lacing -- or black cotton. Email me at email@example.com.