I have to steal gold ones from caves

Place your furnace and stand next to it to smelt your ore into bars. With your two iron/lead bars and eight wood you can now craft a chest! Simply stand next to your workbench and look for the chest icon. That's it!

srsly? it needs iron? ok then thx. also is there a specific place to find rubies? I want to fight king slime

Ruby is a gem found within the Underground and Cavern layers of a world

well I know that, just wondering if any biome has a higher spawn rate

They dont spawn higher in a specific biome unless you include gemstone caves
I just read the whole page in the wiki on rubies

huh. so just stick to spelunker potions and stuff?

yeah ig

o h o k. also, do heart crystals become more common the farther from spawn you are?

*reads wiki page on life crystals*
No

thx.