Coloring Minecraft Items Without Mods

(Self-answer from tegopole):

I thought I'd help out others searching for a way to change an item's color without using mods (since I don't have enough reputation to answer those threads).

After experimentation in 1.16.2, I found that the code:

ITEMNAME{display:{Name:'{"text": "NAME", "color": "COLORNAME"}'}}

Color names:

• blue
• dark_blue
• green
• dark_green
• red
• dark_red
• yellow
• gold
• aqua
• dark_aqua
• light_purple
• dark_purple
• white
• gray
• dark_gray
• black