*As sea glass is battered and broken from a whole object to a fragment, it qualifies as a mineral gem having undergone a beautiful natural refining process in the sea.
*It can take several decades for a thick shard of glass to develop soft rounded edges and at least 50 to 100yrs for a thick piece to become a rounded bauble.
*Sea glass is found where there was heavy shipping traffic around the 1800's to early 1900's.
*Glass bottles from the 19th century and early 20th are the most common source of sea glass.
*During the 1800's, most glass bottles were blue-green, green and brown.
*Early 1900's clear glass became popular and anti-coloring agents were added to offset the colors naturally created by iron oxide found in raw sand.
*After years of exposure to sunlight, some agents produce new colors in the once clear glass, such as purple, lavender and pale yellow.
*Red sea glass is the rarest simply because gold was used to create the vibrant ruby hue.
*Yellow also a rare color was made by using selenium silver and uranium dioxide, also a costly & scarce ingredient.
*Other colors considered unusual are cobalt blue, turquoise, black, teal, gray, pink, cornflower blue, opaque white, green-yellow and purple.
Soft greens, soft blues, amber, and jade are also more challenging to find.