Minecraft 1.13 colored names on items
Like with /tellraw, you'll need to put the components in square brackets ([ ]) to make it a list:
[
{
"text": "GoldenHeart ",
"color": "gold",
"italic": false,
"bold": true
},
{
"text": "Blade",
"color": "white",
"italic": false,
"bold": true
}
]
Escaped and in the command:
/give @p minecraft:golden_sword{display:{Name:"[{\"text\":\"GoldenHeart\",\"color\":\"gold\",\"italic\":false,\"bold\":true},{\"text\":\" Blade\",\"color\":\"white\",\"italic\":false,\"bold\":true}]"}}