Which Unicode version added five emoji skin-tone modifier characters?

Which Unicode version added five emoji skin-tone modifier characters? The answer is Unicode 8.0.

Unicode 8.0, released in June 2015, added five emoji modifier characters for representing a range of human skin tones. They occupy U+1F3FB through U+1F3FF and are named for Fitzpatrick skin types 1–2, 3, 4, 5, and 6.

These characters are designed to follow a compatible human emoji directly. The combination is treated as a single emoji sequence, such as a person or hand shown with a selected skin tone. The five modifiers correspond to six Fitzpatrick categories because the lightest two categories are grouped together.

A common mix-up is to confuse the five modifiers with the many later emoji depicting different professions, genders, families, and skin-tone combinations. Unicode 8.0 introduced the modifier characters themselves; later releases expanded the emoji repertoire and the set of sequences that could use them. Rendering can also vary by platform, since fonts and software determine the exact colors and supported combinations.