The following information is from Rabbi Kaplan’s “Living Torah”. Artscroll don’t translate the names of the stones.
Two Sardonyx stones on the eiphod. Breastplate 1st row on breastplate: carnelian (Reuven), emerald (Shimon) topaz 2nd row on breastplate: carbuncle, sapphire, beryl 3rd row on breastplate: jacinth, agate amethyst 4th row on breastplate chrysolite, onyx jasper
Do you think Rabbi Kaplan is correct? If not, who would be best placed to identify which stones were used and where?
Rabbi Kaplan is uncertain as to which stone corresponds to which tribe. He quotes different opinions such as Targum Yonanatan, Yerushalmi and Tzioni. Is anyone able to answer definitively? Perhaps information exists that wasn’t available to Rabbi Kaplan.