The Hoshen (Khosen) was the breastplate "of Judgment" worn by the High Priest in the book of Exodus in the Bible, covered by 12 stones that represented the 12 tribes of Israel. The stones were arranged in a pattern of four rows of three according to Exodus 28:17-21; sardius, topaz, and carbuncle in the first row; emerald, sapphire and diamond in the second row; lingure, agate, and amethyst in the third row; beryl, onyx and jasper in the fourth. The priest bore the names of the sons of Israel in the breastplate of judgment, upon his heart, when he would enter the Holy place, to bring them in continual remembrance before the Lord, Exodus 28:29.
Shoshana Oliva has created beautiful Judaica pieces based on the 12 stones of the Hoshen, the breastplate, first worn the High Priest Aaron, brother of Moshe, in the Tabernacle in the desert, and subsequently worn by every high priest since while performing his holy duties.
The Hoshen served as an intermediary between the twelve tribes and God.
The Judaica pieces based on the Hoshen are the Kiddush Cup, two mezzuzot cases and a set of pendants.