Gold_bar_small inventory icon

['gold_bar_small'] = {
    label = 'Gold Bar Small',
    weight = 100,
    stack = true,
    close = true,
},

Image goes in ox_inventory/web/images. Set the weight to what fits your server.

gold_bar_small = { name = 'gold_bar_small', label = 'Gold Bar Small', weight = 100, type = 'item', image = 'gold_bar_small.png', unique = false, useable = true, shouldClose = true, description = '' },

Image goes in qb-inventory/html/images. Set the weight to what fits your server.

INSERT INTO `items` (`name`, `label`, `weight`, `rare`, `can_remove`) VALUES
('gold_bar_small', 'Gold Bar Small', 1, 0, 1);

Image goes in your inventory images folder (ox_inventory/web/images on ESX Legacy). Set the weight to what fits your server.