Gemstones of Aaron's Breastplate: Simulated stones is a recreation of what the stones of Aaron's Breastplate mentioned in Exodus 28:15-21 probably looked like. These are simulated stones, not real stones. This recreation is based on the Hebrew. Information about each stone is listed on the back of the box. The stone sizes are about 3/4 of an inch wide. They are in a clear plastic box 4 1/2" by 3 1/2".