Love gold badges on a Lexus and imo they suit any MK1 IS, MK1/2 GS or LS400. Oddly that was not my view when the models were current.
Specifically for the LS400, local dealers offered the optional gold pack priced between £800 and £1000. This included all the rear badges, front grille emblem, wheel centre cap emblems and the fixing ring and cap on the electric aerial. It is 24 carat gold plate.
My LS came with the gold pack but all were tarnished or faded. Some were salvageable but for one or two I bought silver eBay replacements and then tracked down the local plater who used to do it for Lexus Sheffield. He had a look and said he'd charge me what he used to charge Lexus..... (gulp!)...... 80 quid