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.
And the fourth row: a chrysolite, and an onyx, and a jasper. They shall be set in gold in their fillings.
And the fourth row: a chrysolite, an agate, and a jasper; set in plaited work of gold in their settings.
You have been in Eden the garden of God; every precious stone was your covering, the ruby, topaz, and the diamond, the beryl, the onyx, and the jasper, the sapphire, the turquoise, and the emerald, and gold. The workmanship of your tambourines and of your flutes was prepared in you in the day that you were created.
the fifth, sardonyx; the sixth, sardius; the seventh, chrysolite; the eighth, beryl; the ninth, topaz; the tenth, chrysoprasus; the eleventh, hyacinth; the twelfth, amethyst.