Lots of jewelry companies offer “interest-free” loans upon a purchase. The interest is built into the margin of the purchased item.
I guess I don’t see the smoking gun here.
I have NEVER heard of a family with its own six-figure charge account at the jeweler. Newt's account for his wife makes no sense unless he's personally reeling in a minimum of $7 million/year, which seems damn unlikely. And even then, why give all your biz to one shop? Gals like variety and surprise in the trinket department.
BUT, that account as a blind for a "free jewelry" bribery scam makes a whole lot of sense.