Sea glass comes in many sizes and shapes. These include frosty glass marbles or bubbles, which are perfectly round. Sea glass “rounds,” formed from the bottom of bottles, may still retain some embossed pattern identifying their origins, and campfire glass has been melted before being discarded and worn smooth in the ocean.

Most sea glass comes from broken bottles, so it is clear, white, brown, or kelly green. Green, brown and clear glass mostly comes from beer bottles, wine bottles, and other beverage containers. White and clear glass come from windows, windshields, glasses, and other sources. However, there are rare colors, which are more valuable.

Common - White, Green, Brown found in most beach combing locations throughout the world. Unique colors are Greens Browns and Whites glass with age, thickness or patterning. Unique - Olive greens, pale amber's. Somewhat Rare - Seafoam Green (light greens), Pale Aqua, Amber, Rarer Greens Rare - Cobalt Blue, Lavender, Aqua, Light Blue, Lime Green