|A large and thick nugget of brown sea glass|
Brown sea glass actually comes in a number of different shades, ranging from "almost black" to amber. The paler shades tend to be scarcer. There are practical reasons for this: the brown color is obtained by adding iron oxide to the glass "batch," and the more is added, the more durable the glass becomes. Collectors generally find that any large pieces of brown also tend to be darker colors. The true "honey" or "mustard" colored amber sea glass is very rare in larger sizes. The difference between golden/honey amber and brown glass can fairly easily be seen when you hold each color up to the light, side by side.
Because most brown tends to be somewhat dark and often looks "blackish" away from strong light, this color is rarely used by artists and jewelers for their creations. That said, it can be very pretty when used for framed art to be hung in a window, backed by natural light. The pieces in the photo at left are mostly smaller (1/2" or less) and are shown here in bright sunshine-- where they show in a more vibrant and "warm" color.
To see pictures of more pieces of brown sea glass, please visit my Brown Sea Glass Photo Gallery on Flickr!