Last month, I found a large chunk of cobalt blue sea glass on the shores of Stehli Beach in Bayville. I was thrilled, especially since previous pieces were more like slivers.

Sea glass can be beautiful and free keepsake from a beach visit, great for displaying or crafting. Here's where to look in ...

Mary Beth Beuke, author of the new book Ultimate Guide to Sea Glass, sifts through tens of thousands of fragments and explains her color-rarity analysis.