This is incredibly unusual, I have never seen a Bohemian garnet eternity band. This ring is set all the way round with deep red rose cut garnets. The metal this ring is made of is referred to as garnet gold, a type of jewelers brass, typically used in these 19th century garnet pieces made in Bohemia.
Details.....Currently a size 6.75, this ring cannot be sized. The width of the band is 3.1mm. The ring shows wear in accordance with its age, it dates from the 1860's.