The color of sea glass is determined by its original source. Most sea glass comes from bottles, but it can also come from jars, plates, windows, windshields, ceramics or sea pottery. The most common colors of sea glass are kelly green, brown, white(clear), and purple(clear). Less common colors include jade, amber, golden amber or amberina ,lime green, forest green, and ice- or soft blue These colors are found about once for every 25 to 100 pieces of sea glass found. Purple sea glass is very uncommon, as is citron, opaque white, cobalt and cornflower blue and aqua. These colors are found once for every 200 to 1,000 pieces found. Extremely rare colors include gray, pink, teal, black, yellow, turquoise, and red. Orange (the least common type of sea glass, found once in about 10,000 pieces). From Wikipedia.
Sea glass can be found all over the world, but the beaches of the northeast United States, Bermuda, California, northwest England, Mexico, Hawaii, Puerto Rico, Nova Scotia, Australia, Italy and southern Spain are famous for their bounty of sea glass, bottles, bottle lips and stoppers, art glass, marbles, and pottery shards. The best times to look are during spring tides especially perigean and proxigean tides, and during the first low tide after a storm.
Glass from inland waterways such as Chesapeake Bay and the Great Lakes is known as beach glass. It is similar to sea glass, but in the absence of wave rigor and oceanic saline, content is typically less weathered.