Making doublets

I need to make two sodalite doublets and two agate doublets and need
caps on the order of 1-1/2"x1-1/2". Does anyone have a source for
the quartz caps or be willing to let me purchase six of them? Yes, I
realize the agate doesn’t really need a cap, but the doublets are
being used as the fields of color on two coat of arms emblems and I
want the depth of field to be the same as the sodalite which does
need a cap.

Warm Regards,
Shawn

   Does anyone have a source  for the quartz caps or be willing to
let me purchase six of them?  

Hi, Shawn … try www.opalsmith.com . They have high-dome quartz
caps for sale in addition to opal. LollyJ