A sardonyx gem, thought to have been one of two that were set in gold on each shoulder of the breastplate and deemed to be 'forms of divine communication', was discovered in South Africa.
The owner claims the stone was given to a distant ancestor as a reward from the High Priest in 1189 and has been passed from generation to generation of the family since.
What makes this sardonyx so unique is it has a tiny Hebrew inscription, which is believed to be an ancient script that dates back to 1000 BC, burned or engraved in the heart of the stone. The letters in the stone appear to be similar to those found on archaeological finds dating from 1300 to 300 BC.
The Jewish text Talmund reveals that questions would be brought to the breastplate worn by the High Priest and the stones would light up to spell the answers.