Visit this website and go there, if your brother has 40K on just a diamond, this is where you should go, they will educate you on what to look for and help you find the best for your money. Their office is in downtown Long Beach. I used to work there few years back. Ask for Mark Schneider himself, a very good honest man, he is the owner and he will take care of your brother.
Engagement Rings and Fine Colored Gemstone Jewelry | Mark Schneider Design