4 Carat Diamond Prices

What a 4 Carat Diamond Actually Costs

4 carat sits between the headline milestone weights, which is where most of the genuine value lives in the diamond market. Retailers carry fewer stones at this weight, but the ones they do carry are priced more competitively because they can't ride the psychological premium of 1ct, 2ct, 3ct and so on.

We're tracking 567,865 active listings at 4 carat right now. A typical natural diamond in this range costs around ￥9,072,957 JPY while the lab-grown equivalent sits at roughly ￥325,355 JPY, about a 27.9× ratio. That gap is normal because lab-grown has been trending down in price steadily while natural holds value.

RADIANT accounts for about 24% of 4 carat inventory. Consistent with round being the classic engagement ring choice. Fancy shapes (oval, pear, cushion) trade at slight discounts per carat compared to round, partly because they use more of the original rough crystal so they're cheaper to produce.

At 4 carat, the sweet spot for most buyers is E color with VS1 clarity. This combination is eye-clean, face-up indistinguishable from a D/FL on paper, and typically costs 40-60% less. The money you save there is far better spent on cut grade. Excellent or Ideal. Because cut drives sparkle more than any other single grade.