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 ...

Next to them is one cobalt-blue sea glass swizzle stick, probably from a restaurant in New Bedford, Mass., the city where she found it. (She located a similar one intact at an antique store.) ...

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.

The cobalt used for blue-and-white ceramics was locally mined in China and has a high manganese content. But famille rose porcelain needed finer European cobalt, which gives a purer blue.

Neutron scattering studies of "cobalt blue," a compound prized by artists for its lustrous blue hue, ... In cobalt aluminate's case, however, the glass-like behavior is exhibited on a very clean, ...