Shop our certified Asscher Cut, 4 Carat loose diamonds to design your own custom engagement ring. Once you've selected your diamond, take the next step and pair it with a ring setting and metal of your choice, from gleaming platinum to romantic rose gold. Discover the details behind your diamond's 4C grades in its individualized GIA or AGSL certification report. For expert advice on your purchase, consult our non-commissioned virtual gemologist service or our outstanding customer service team. If you've chosen your diamond but you still aren't completely sure it's “the one”, you can preview it in-person at one of our authorized local jewelers.