Red Diamond Details
Cause of Color: Similar to pink and brown diamonds, color in red diamonds is generally thought to be caused by colored graining, which results from structural irregularities in combination with an impurity.
Secondary Colors: Red is the color between purple and orange, so common secondary colors in red diamonds include orangish red, purplish red and brownish red.
Rarity: Pure red diamonds are known to be the rarest of all fancy colored diamonds, and they command the highest prices. Weighing 5.11 carats the Moussaieff Red Diamond is the largest graded fancy red diamond in the world.
Grading: Red diamonds are graded as Fancy Red with modifying hues.
Mining: During its lifespan, Australia’s Argyle Diamond Mine produced most of the world’s red diamonds. The mine was closed in 2020. Brazil is another source of reds.