Urim & Thummim: Real Stones Oval to round in shape. Shape and size may vary slightly. The real stones are about 1 1/8 inches long by about 7/8 of an inch wide. Real Stones Used for the Urim and Thummim in ancient times. Stones come in a plastic bag with information about them. Bag size is about 6 1/2 inches by 5 7/8 inches. History: Urim and Thummim Exodus 28:30 ï¿½And thou shalt put in the breastplate of judgment the Urim and Thummim; they shall be upon Aaronï¿½s heart when he goeth in before the Lord.ï¿½ The Urim and Thummim was Godï¿½s way of answering His people. Urim (××•×¨×™×) means ï¿½lightï¿½ and Thummim (×ª×ž×™×) probably means ï¿½darkness/truth.ï¿½ Possible recreation; Urim, white stone means no for an answer, and Thummim black stone means yes.