Probably the ancient topaz of a golden colour. Re 21:20. The Greek word ?????????? occurs in the LXX in Ex 28:20; 36:20 (Ex 39:13); Eze 28:13.
the fifth a sardonyx; the sixth a carnelian; the seventh a chrysolite; the eighth a beryl; the ninth a topaz; the tenth a chrysoprase; the eleventh a hyacinth; and the twelfth an amethyst.