FYI: they is such a thing as fake conch pearls that are made out of the shell of the conch, so buyer beware. Now I am not suggesting that there is or ever has been anyone in Belize that would take advantage of a tourist, so do not infer anything into this comment that is not intended.
I searched for about 3 years 30 years ago to find four pearls the size and color I wanted to make ear rings, pendant and a ring. My wife thought they turned out beautiful, although I thought a couple of rods and pen international reels would have been more beautiful.
PS; here is a web page of some interest. I do not totally agree with eveything on it, but it has some good points. They are many other web pages you can look at for info on conch pearls.
http://www.jewelrygenius.com/conchpearls.html