I couldn't find suitable funds with the exception of ETFs.
ZKB offers one of the largest gold ETFs in various currencies, including Swiss francs, and a silver ETF, also in various currencies. Both ETFs are backed by physical gold and silver respectively and are considered relatively safe. You should clarify in which amount, denomination and at what cost the gold can be delivered. Advantage: low costs when buying and selling, relatively safe, exact replication of the commodity price. Disadvantages: Recurring annual costs of 0.4% (gold) or 0.6% (silver).
In principle, these ETFs are well suited for short- to medium-term investments in precious metals, because buying and selling is cheap and uncomplicated compared to physical investments in precious metals. In the long term, the one-off transaction costs are less significant and physical buying is recommended.
When you buy coins or bars (e.g. at pro aurum or degussa), one-off costs of between 3 and 5 per cent must be expected (spread of the corresponding future price).