Joan Rivers' Penthouse Treasures for Sale

Joan Rivers' lavish lifestyle -- or the symbols of it -- are about to be auctioned off, and while Joan was hysterical ... the going rate on her stuff is no joke.

Christie's in New York will put more than 200 items from Joan's Manhattan penthouse on the auction block. Everything from art, furniture, jewelry, and costumes will go to the highest bidder -- and a portion of the proceeds will go to 2 charities: God's Love We Deliver and Guide Dogs for the Blind.

A few of the notable items include an Edouard Vuillard painting -- expected to fetch $180,000 ... and an 18k gold and diamond watch for $10,000.

80 of the items will be sold online from June 16-23. The rest will go in a live auction on June 22nd.