A collector was showing me some very nice stars in quartz from Sri Lanka that had a yellowish background color and a very sharp and bright star.
I have seen some yellow asteriated quartz cabochons, all rather
large, offered for sale by a gem dealer I do business with. I asked
about them once and recall being told they were from Brazil. The
cabs were at least quarter-sized with very high domes and sharp
stars. They didn’t have the haziness I’ve previously noticed in star
quartzes. I’m planning to visit that dealer in the next week or two
and will try to get more for you.