Murano, Venetian, Bohemian and crystal glass: what each word means

At a glance

Five words, four questions

A quote can say Murano, Venetian, Bohemian, crystal and cut as if they were alternatives. They are not. They answer four different questions: where the glass was made, what style it follows, what it is made of, and how its surface is made. One chandelier can answer all four, for example Venetian in style, made in Murano, in a soda-based glass, and left uncut.

The words that cost money when they go wrong are the ones that claim a place or a composition, because a reader relies on them and cannot check them by eye. Style and process can be judged on a sample. Of the five words, only “crystal” has a legal definition we could find. We found none for Murano, Venetian or Bohemian as a place of origin on a chandelier; for Murano origin see Is it genuinely Murano?

Make Bespoke Studio coordinates decorative lighting through partner workshops and has no delivered lighting projects to cite. Nothing here says that any studio piece is made of any of these glasses: the workshop states the glass for each element, and the questions below are for it.

What museums say about each word

Murano and Venetian

The Glass Museum Murano (Fondazione Musei Civici di Venezia) says in its leaflet What is glass? that Murano glass has always been a sodium-based glass: the flux is soda, historically from plant ash. Silica makes up about 70% of the finished glass by weight, and to make glass brighter or more luminous the makers add potash, barium carbonate or lead oxide. The same leaflet says its transparent, colourless cristallo is different in composition from both English and Bohemian glass crystal. The V&A says the glassmakers' guild regulations date from 1271, that twenty years later it was decreed that all new glasshouses be on the island of Murano, and that from the second half of the 16th century Venetian glassmakers travelled abroad and continued their work in this style. That is where “Venetian” becomes a style and not a place.

Lead glass and lead crystal

The Corning Museum of Glass defines lead glass as glass with a high percentage of lead oxide, at least 20% of the batch, first patented in 1674 by George Ravenscroft and given more lead in 1676. It is relatively soft, and its refractive index gives a brilliance that polished wheel-cut facets exploit. “Crystal” is, in its words, a popular term for colourless lead glass, and in the United Kingdom glass described as crystal must contain a defined percentage of lead oxide. Note that the museum's 20% is of the batch and is a definition of lead glass, while the legal figures below are of the glass and define a description. A V&A record of an English drinking glass of 1676 to 1677 calls it lead glass and records that a London dealer had earlier ordered crystal glass versions from a Venetian glasshouse.

Bohemian

A Corning gallery text says that from the late 17th century English glasshouses made glass more brilliant by adding lead oxide, while the Bohemians achieved similar effects by adding chalk, and that Bohemian and German glasshouses produced decolorised glass that was carefully cut and engraved. A Corning library note adds that glass chandeliers were made in France, Bohemia, Venice and England in the 18th century. So “Bohemian” tells you about a place and a tradition of cutting. It does not tell you whether lead is present.

Cut, pressed and the rest

The V&A describes cutting as grinding away part of the surface with a rotating wheel of stone, wood or metal fed with water and abrasive, then polishing with softer wheels, and says the very clear colourless glasses developed in late 17th-century Europe were well suited to deep cutting. Corning describes pressed glass as molten glass pressed in a metal mould with a plunger. We found no museum or legal source on how machine-cut crystal-glass components are made or what they contain, so the table says so and does not guess.

Museum sources differ in places. Corning says Venetian cristallo of the late 1400s used quartz sand and potash, while the Murano leaflet says Murano glass has always been soda-based, with purified plant ash giving the “crystal salt” for cristallo. Corning's dictionary also says most Venetian cristallo has a grey or brownish tint, against the Murano leaflet's colourless. We use none of this to write a composition: ask the workshop.

Crystal as a legal word

In UK law the word is controlled. The Crystal Glass (Descriptions) Regulations 1973 (SI 1973/1952) make it an offence to supply, or offer to supply, glass in the course of a trade or business with one of the four sets of descriptions in their Schedule unless the glass has the composition and properties the Regulations require (regulations 3 and 4). A trade mark, company name or inscription that has one of the descriptions as a main part, adjective or root must be preceded in very prominent lettering by the description or by a statement of the exact nature of the glass (regulation 6). The Schedule states that the percentages in the first two descriptions are lead oxide content. The numerical tests sit in annex I of Council Directive 69/493/EEC, which legislation.gov.uk publishes and which is the same four-category table:

Annex I, column (d) onward. The refractive index in the footnote to categories 1 and 2 (1.545) is an additional non-destructive check for imports, not a requirement. These are minimums. The Directive's own scope is products of heading 70.13 of the Common Customs Tariff, and the 1973 Regulations define glass as glassware within heading 70.13 of the Customs Tariff 1959.

Does this reach a chandelier? It is not settled by anything we read. In today's UK tariff heading 7013 is glassware of a kind used for table, kitchen, toilet, office, indoor decoration or similar purposes, and Chapter 70 says it does not cover luminaires and lighting fittings, or parts of them, of heading 9405. We did not read the 1959 tariff, so whether it drew the line in the same place is unchecked. Treat the description as a promise a buyer can rely on whatever the legal answer: ask for the category and the declared composition, and write them into the contract.

Two other facts a specifier should know. First, BSI Knowledge lists BS 3828:1973 Specification for crystal glass, the standard the 1973 Regulations name, as withdrawn on 13 June 2024. The Regulations refer to that edition by date, and we cannot say what the withdrawal means for the legal test. Second, UK RoHS (SI 2012/3032, England, Wales and Scotland) restricts lead in electrical equipment to 0.1% by weight in homogeneous materials (regulation 3 and Schedule A1), and its Schedule A2, Table 1, entry 44, exempts lead bound in crystal glass as defined in categories 1, 2, 3 and 4 of annex I of the Directive. Lighting equipment is listed among the categories of equipment for that entry, with the status “transitional case”, not an expiry date; we did not read the rule that defines that status. So for an electric fitting that is in scope of RoHS, the category of its crystal glass matters. Whether a particular bespoke fitting is in scope (large-scale fixed installations are excluded, Schedule 1, Part 2) is a question for a product-compliance adviser, and we do not answer it.

Weight. Because the annex sets minimum densities, we can say something exact about weight and nothing more. For the same volume of glass, the legal minimum for lead crystal (2.90) is about 18 per cent heavier than the lowest crystal glass (2.45), and the minimum for full lead crystal (3.00) about 22 per cent heavier. These compare minimums, not typical glasses, and the shape matters far more: on a hollow sphere 300 mm across, a 12 mm wall holds about 3.8 times as much glass as a 3 mm wall (see the wall-thickness chart on Murano glass techniques at a glance). Ask for the declared weight of the complete fitting, with its glass types, and give it to the structural engineer.

How each treats light

The brief usually decides which glass family to look at, and light is the reason. Corning says the refractive index of lead glass gives a brilliance that polished wheel-cut facets exploit, which is the sparkle a cut crystal drop throws. A hand-blown piece with a thick wall behaves differently: the wall carries colour and gives a glow. This is our reading of how the two are used, drawn schematically, and it is not an optical calculation.

Neither effect can be judged from a catalogue picture. Sparkle depends on the cut, the polish and the lamp; glow depends on the wall, the colour and the dimming. Approve a sample under the project's lamps and at its dimming levels as part of approval: see sample hierarchy and approval and, for the hand-made variation to expect, acceptance criteria for handmade glass.

Choosing: what the brief says, what to ask, what to write

Start from the effect the brief wants, then ask for the answer to each question in writing. The table is our arrangement, not a published rule.

Each glass element is to be [hand-blown soda-lime glass / crystal glass, category 3 of annex I of Council Directive 69/493/EEC / lead crystal, category 2 (PbO 24% or more, density 2.90 or more)] as stated on the shop drawing. The workshop is to declare, for each glass type, the oxide contents and density, with test evidence [ ]. 'Crystal' is not to be applied to any element unless it meets the description for the category named.

Place of making for each element: [Murano / Bohemia / other, as stated by the workshop]. The style reference [Venetian] is to form only, not origin. Cutting: pattern [ ], polish [ ], cut by [ ] at [place].

A composition declaration for each glass type, signed by [workshop]. Where the fitting is electrical equipment, the workshop is to state in writing how lead in glass is treated under the UK RoHS Regulations 2012 and which exemption, if any, it relies on. The declared weight of the complete fitting, with its glass types, is to be on the shop drawing.

Standards and sources

• Council Directive 69/493/EEC, annex I (crystal categories): legislation.gov.uk, revised 1 Jan 2007; EU status not checked.
• Crystal Glass (Descriptions) Regulations 1973, SI 1973/1952: names BS 3828:1973, which BSI lists as withdrawn 13 Jun 2024 (not read).
• UK RoHS, SI 2012/3032, Schedules A1 and A2 (entry 44); UK Global Tariff, Chapter 70 notes: England, Wales and Scotland text; tariff read 5 Nov 2026.
• Museum sources: Glass Museum Murano leaflet; V&A An A to Z of glass (17 Apr 2024); Corning Museum of Glass pages (Internet Archive copies).

Questions we are asked

Is Murano glass crystal?

Not by name. “Murano” says where and how glass is made, while “crystal” is a legal description of composition. The Glass Museum Murano says Murano glass has always been sodium-based and that its clear cristallo differs in composition from English and Bohemian crystal. Ask the workshop to state the glass type for each element and, if crystal is claimed, the category and the declared composition.

Is Bohemian crystal lead crystal?

Not necessarily. The Corning Museum of Glass says Bohemian makers brightened glass with chalk where English makers used lead oxide, and Bohemian and German glasshouses cut and engraved it. A Bohemian product may fall in any of the four annex I categories or none, so ask for the declared composition and category.

What does “lead crystal” mean in UK law?

Under the Crystal Glass (Descriptions) Regulations 1973 and the annex I table they follow, lead crystal is glass with at least 24% lead oxide and a density of at least 2.90, and full lead crystal at least 30% and 3.00. Supplying glass under those descriptions when it does not meet them is an offence. Whether the Regulations reach a chandelier's glass elements is not settled by anything we read, so ask for the category either way.

Is Venetian glass the same as Murano glass?

No. Venetian describes a style, the ornate many-armed form, and a Venetian-style chandelier can be made anywhere. Murano describes where and how the glass is made. See Is it genuinely Murano?

What is the difference between cut glass and crystal?

Cut describes how the surface is made: a rotating wheel grinds facets and the glass is polished. Crystal describes what the glass is made of. Any glass can be cut, but Corning notes that soft, high-index lead glass suits polished wheel-cut facets.

Does lead crystal weigh more than other glass?

At the legal minimum densities, yes, for the same volume: lead crystal (2.90) is about 18 per cent heavier than the lowest crystal glass (2.45), and full lead crystal (3.00) about 22 per cent. Wall thickness matters far more on hand-blown pieces, so ask for the declared weight of the complete fitting.

Can I ask for crystal glass that does not contain lead?

Categories 3 and 4 of annex I, crystal glass and verre sonore, count zinc, barium, lead or potassium oxides singly or together, so lead is not required for them. Whether a given product contains lead is a composition question: ask the workshop for the declared composition and which category it claims.