Buttons with citrine and gilded silver

Length 1.4 cm. Width 1 cm. 8 rare buttons from the mid-19th century. The buttons are with faceted golden citrines and framed in gilded silver, which gives the citrines a fine sheen. They are all oval with a small ring on the back. We've never seen buttons with semi-precious stones before. One button has a lighter stone, this has probably been replaced and one button has come up in a solder joint. This can be arranged if desired.