Diamond jewelery from US does not hold it's value if you want to sell it in future. Keep that in mind when you buy any jewelry from US brand name sellers. Better option would be to get jewelry made in Nepal (not to buy ready made ones) from respected jewelry stores. That way you won't lose the value of gold/silver/diamond in long term. Price and value of diamond from US is way to hyped and that's why jewelry stores in US will not buy back the jewelry they sold and if they buy back, they will only pay you about half of what you paid for or they will pay you back 100% if you agree to buy much expensive jewelry from them.