Rare Black & Deep Cobalt Blue Seaham Sea Glass – Genuine English Beach Glass Piece

A stunning and highly unusual piece of genuine Seaham sea glass with a hidden cobalt blue glow.

On first appearance, this piece looks almost black, with a smooth dark frosted surface created naturally through decades of tumbling in the North Sea. However, when held up to bright light, the glass reveals a rich deep cobalt blue translucency that completely transforms its appearance.

This striking effect makes the piece especially desirable among sea glass collectors, as dark glass with hidden colour tones is becoming increasingly difficult to find. The contrast between the dark exterior and vibrant blue illumination gives it an almost gemstone-like quality.

Handpicked from Seaham Beach on the North East coast of England, this piece has been naturally shaped and softened by the sea over many decades.

Details

• Genuine Seaham sea glass
• Rare near-black exterior
• Deep cobalt blue translucency when backlit
• Naturally ocean tumbled and frosted
• Smooth oval shape
• Handpicked from Seaham Beach, England
• You will receive the exact piece shown in the photographs

Size

Shown in the photographs being held between fingers for scale.

Ideal For

• Sea glass collectors
• Rare colour collectors
• Jewellery making
• Wire wrapping projects
• Coastal décor
• Curiosity displays
• Gifts for beachcombers and sea glass enthusiasts

Its hidden cobalt blue colour makes this a particularly eye-catching and unusual collector’s piece, especially when displayed with light shining through it.

Seaham is world famous for its sea glass heritage, where historic glass waste from old bottleworks and glass factories was naturally weathered and frosted by the sea over many decades.