This is a lot of 3 big chunky pieces of black genuine surf tumbled sea glass. These are thick heavy very well worn pieces that have been in the ocean for possibly 200 years. They weigh 38, 42 and 43 grams.When held up to bright light they reveal drak green, dark olive and teal colors. These are so dark and worn that they look like rocks on the beach. I personally collected these over the years, mostly in Puerto Rico. All guaranteed to be genuine.