The coral ball on your brooch? Can be glued together? Can I use 502? But be very careful. A little is enough? If you don't pay attention, glue can easily spread to corals, which will make them lose their bright luster. You can also use professional jewelry glue (AB glue), which will be better, but it may not be as convenient as 502. You can also go to a professional jewelry processing place and let them paste it? The charge will not be expensive. By the way, send a beautiful picture of Zhang Tianran red coral corsage for everyone to enjoy.