Here's an interesting read from the Museum of London's Anna Laviniere, a trainee collections manager. Her work involves researching, cataloguing and preserving objects in the collection. She has been remaking some of the embroidery pieces to understand more about them in particular a 1577 embroidered Bible cover said to have been to be crafted by Queen Elizabeth I. If you click on the link above there's a free little project to make a Tudor rose similar to the one a t the centre of the cover.
The materials used are thought to be silver -gilt thread, silver purl and small amounts of silk inlaid and couched work. The free pattern (and instructions) uses cotton and stitches to make an updates version, but no doubt you could try the techniques in the original if you have some goldwork supplies to hand. It looks like a nice project for a lockdown afternoon.