My relative was a doctor. He studied in China and in Harvard University, but he also was a gambler. He bought lottery tickets and flow to Las Vegas four times a years, and played the stock market. He was very successful. Every time he went to Las Vegas, he carried this item with him and before every stock trade, he was meditating with this item. He considered to be the source of his winnings, success. The Diameter 58mm and thickness 13mm. This very old jade has four fine carvings of Lucky frogs and two elegant carvings of Lucky bats made out of fine jade vivid green color. I do not gamble. I do not need it. He left me enough money. Good Luck to everyone, I will not stop the auction. The highest bidder wins.