What Is The Estimated Worth Of A Tiffany Hanging Lamp?

I received a Tiffany Hanging Lamp (a real Tiffany, not fake) from my grandparents who bought it when they were recently married so it was purchased back in the late 40′s early 50′s. It is approximately 3-4 feet wide and it has grapes on it. I saw one on Ebay this size that had grapes and pears on it and it was going for approximately $50,000.00. This lamp has one stain glass piece missing, and one edge pieces is just hanging on by a thread (however, as far as I can remember it has been like that. My grandma said that it is worth a lot of money but I just wanted to know if anyone would know the approximate value. My husband and I thought maybe we should get it insured if it has a high value.What Is The Estimated Worth Of A Tiffa