No. Texas exempts gold and silver bullion, as well as coins, from state sales tax. This exemption applies to precious metals sold for their metal content rather than as collectibles or numismatic items, provided they qualify as legal tender or investment-grade bullion.
The law was enacted to encourage precious metals investment within the state and align Texas with many other states that treat bullion as a form of money or investment rather than a taxable good.
If you are buying gold bullion from a Texas dealer, you generally will not see sales tax added to your purchase, though it is wise to confirm the exemption applies to your specific transaction, since rules can vary based on the item type and seller.