YELLOW POINT = low level bosses (tapisan equipment / yellow stones)
ORANGE POINT = mid level bosses (unik equipment / violet stones )
TRED POINT = high level bosses (elite equipment / reds stones )
Although its not totally correct, but you still could refer as pin point. It’s found that bosses appear in 1 hour or 30 minutes time, but it’s random. I’ll try to post exact time in future. So stay tune.
Credit to Summer on JINONLINE forum