Every year, thousands of pieces labelled "Murano glass" are sold around the world. Only a fraction of them are real. The island of Murano has been producing extraordinary glass since 1291, and its legacy is so powerful that counterfeiters have been exploiting it for decades. Whether you're buying a vintage pendant light, a vase, or a table lamp, knowing how to tell the genuine article from an imitation can save you money — and connect you to something truly irreplaceable.
Here is what to look for.
1. The Pontil Mark
Every piece of hand-blown Murano glass is finished on a pontil rod — a long iron rod used to hold the glass while the glassblower shapes it. When the piece is detached, it leaves a small rough mark on the base, known as the pontil mark. On authentic vintage pieces, this mark is hand-polished but never perfectly smooth. It has character.
If the base of a piece is laser-cut flat and flawless, it was almost certainly made by machine — not by a Murano maestro.
2. Colour Layers (Sommerso Technique)
One of Murano's most celebrated techniques is sommerso — Italian for "submerged". It involves encasing one or more layers of coloured glass within a clear outer shell, creating a luminous depth that no surface tint can replicate.
Hold a piece up to the light. Authentic sommerso glass reveals two or three distinct colour strata, each with its own depth and intensity. A fake will show a thin, uniform surface colour with no inner dimension.
3. Tiny, Irregular Bubbles
Perfection is the enemy of authenticity in Murano glass. Hand-blown glass almost always contains tiny, irregularly scattered bubbles — microscopic air pockets trapped during the blowing process. They are not defects. They are proof of the human hand.
Mass-produced glass is either bubble-free (machine-made) or contains suspiciously uniform bubbles (a deliberate imitation of the handmade look). Neither is the real thing.
4. Asymmetry and Imperfection
No two authentic Murano pieces are identical. Hand-blowing means that arms are slightly uneven, swirls don't repeat perfectly, and edges have a gentle irregularity. This is not a flaw — it is the signature of the maker.
If every element of a piece is perfectly symmetrical and uniform, it was made by a machine, not a maestro.
A Quick Reference Table
| Test | Authentic Murano | Red Flag |
|---|---|---|
| Pontil mark | Rough, hand-polished circle on base | Laser-cut perfect base |
| Colour layers | 2–3 visible glass strata | Thin surface tint only |
| Bubbles | Tiny, irregular, scattered | Uniform or absent |
| Symmetry | Slight, natural irregularity | Machine-perfect uniformity |
Why It Matters
Authentic vintage Murano glass is not just decorative — it is a piece of living history. Each lamp, vase, or sconce was shaped by hands that learned their craft through generations of tradition, on an island that has been the centre of the glass world for over 700 years. Owning one is owning a fragment of that story.
At Vintage Glass Gems, every piece we source is carefully examined for authenticity before it reaches you. We photograph pontil marks, document labels, and describe techniques so you can buy with confidence. Browse our vintage Murano pendant lights, wall sconces, and table lamps — each one genuine, each one unique.