There are several ways of doing this: for most pieces, the jeweler puts in an order of a variety of gems from various wholesalers, including diamonds, from one or several diamond dealers.
(the jeweler; puts; in an order of a variety of gems from various wholesalers, including diamonds, from one or several diamond dealers)
the jeweler
puts
in an order of a variety of gems from various wholesalers, including diamonds, from one or several diamond dealers