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Most Robinhood Gold Cards are made of stainless steel and weigh 17 grams, making this card one of the heftiest metal credit cards on the market. Top-tier Gold members can even request theirs in real 10-karat gold. Interested applicants must refer 10 or more subscribers to the Robinhood Gold membership to be eligible for the 36-gram precious-metal credit card.
From: Robinhood Launched a New Credit Card, and Some Are Made of Real Gold.
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My American Express Platinum card weighs 17g, so it is clearly not made out of platinum (otherwise it would cost about $500 or something). But 36g of 18 carat gold costs a couple of thousand dollars! Either way, making the cards out of expensive metal for me is a waste of money, since the cards sit in a drawer at home while I use my phone or ring to pay for things. In fact when I went looking for my Platinum card in order to weigh it, I’d forgorten where it was and it took me a while find it (I realised I’d moved it to my travel wallet a couple of weeks ago).