Sea glass and machine-tumbled glass can look similar at first glance. Neither appearance nor touch alone can prove where a piece came from, but a closer look can help you understand their differences.
Look at the surface
Glass shaped by the sea often has a softly frosted, matte finish. Under close inspection, you may also see small pits or uneven patches. Machine-tumbled glass can be frosted too, so a matte surface is a clue, not a guarantee.
Notice the shape and edges
Natural pieces often have irregular outlines and gently rounded edges, with subtle differences from one side to the other. A tumbler can also smooth sharp edges, which is why shape alone is not a reliable test.
Hold it up to the light
Many pieces of sea glass are translucent: light passes through them, even when the surface looks opaque or frosted. The effect varies with the glass's colour and thickness. Machine-tumbled glass can be translucent as well.
Consider the whole piece
Frosting, pitting, irregularity and rounded edges together can help you assess a piece, but none is definitive proof of natural origin. If provenance matters to you, ask the maker what they know about the glass and how it was sourced.
Explore sea glass jewellery
At Sea Dreams Jewellery, handcrafted designs put the character of each piece of glass centre stage. Browse the Seaham Sea Glass Pendants and Sea Glass Earrings collections to find a style you love.