How to Tell Real Crystal From Glass on a Used Chandelier

A woman once brought my father a chandelier she had bought at an estate sale for a price that made her nervous. The seller had called it antique lead crystal. Within a minute of holding one prism to the workshop window, my father told her it was pressed glass from a mould, probably from the 1970s, and worth perhaps a fifth of what she had paid. She was not upset with him, but she was quiet for a long time.

Secondhand listings use the word crystal for almost anything that sparkles. Sometimes the seller knows better, often they honestly do not. If you are buying a used chandelier, from a marketplace listing, an auction house or a salvage yard, these are the checks I learned as a child among glass drops and brass arms, and the ones I still do before I hand over money.

What "crystal" actually means, and what it does not

In the trade, crystal traditionally means glass with lead oxide added. Lead makes the glass denser, softer to cut and more refractive, which is what gives a good prism that rainbow flash. In the European Union the labels are regulated: full lead crystal must contain at least 24 percent lead oxide, and high lead crystal 30 percent or more. Below that you may see "crystal glass" or "crystallin", which can contain much less, or none.

Outside those rules the word is loose. A great many modern chandeliers sold as crystal use K9, which is an optical borosilicate glass with no lead in it. K9 is clear and takes a cut well, and it is perfectly respectable for the price, but it is not lead crystal, and it should not be priced as if it were. Then there is acrylic, which is plastic, and moulded glass, which is glass poured or pressed into a shape rather than cut.

None of this means lead crystal is always the right choice. It is heavier, so the frame and ceiling must carry more, and it is softer, so it scratches more easily. The point is to know which one you are paying for.

Six checks you can do in five minutes

Bring a small torch, a jeweller's loupe if you have one, and a soft cloth. Ask the seller if you may remove one or two prisms; a reasonable seller will say yes.

Weight in the hand

Hold a prism from the chandelier in one hand and a similar sized piece of ordinary glass, or even a glass marble, in the other. Lead crystal feels surprisingly heavy for its size, because it is denser. Acrylic feels almost weightless and slightly warm. This is a rough test, but it rules out plastic at once.

Light through the prism

Hold a prism up to daylight or shine the torch through it onto a white wall. Good lead crystal throws a strong, wide rainbow with distinct colour bands. K9 also throws a decent rainbow, so this test separates crystal from cheap glass and acrylic more reliably than it separates crystal from K9.

The edges under a loupe

This is the test my father trusted most. A cut and polished prism has crisp facet edges that meet at sharp lines. Pressed glass has slightly rounded edges and, very often, a faint seam where the two halves of the mould met. Look along the side of the prism for a fine raised line. If you find one, it was moulded.

Bubbles and waves

Older handmade crystal sometimes contains tiny bubbles or faint wavy lines, called striae. These are not defects in an antique piece; they are evidence of age. Perfectly flawless prisms on a chandelier described as nineteenth century should make you a little suspicious.

The sound, used carefully

Lead crystal rings with a long, clear tone when tapped gently with a fingernail. Glass gives a shorter note, and acrylic only clicks. Small prisms are too tiny to ring well, so try this on a larger piece such as a glass bowl, a bobeche (the drip pan under each candle) or a large pendant drop.

Scratches and wear

Run the cloth over a prism and look at it in raking light. Acrylic shows fine scratches everywhere and attracts dust through static. Lead crystal, being softer than ordinary glass, may show small chips along edges on an old piece. A chandelier that is decades old but shows no wear at all may have had its drops replaced, which is common and affects value.

The common advice that misleads buyers

You will hear people say that the heavier the whole chandelier, the better the crystal. I have lifted many fixtures, and the frame usually carries more of the weight than the glass does. A cast brass or iron body can be enormously heavy and still be hung with acrylic drops. Judge the prisms, not the fixture.

The second piece of folk wisdom is that a crystal will always feel cold against your cheek. Glass and crystal both feel cooler than plastic, so this tells you about acrylic, not about lead content. I would not rely on it for anything beyond that.

Ask what the prisms are made of, then check one yourself. A seller who refuses to let you hold a prism has told you something too.

Look at the pins and the frame as well

The small metal connectors that link the drops tell their own story. Older European chandeliers often used hand bent brass wire pins, slightly irregular, sometimes darkened. Modern pieces use uniform chrome or bright brass clips, and repaired chandeliers frequently mix both. Mixed pins do not ruin a chandelier, but they suggest some drops have been replaced, and you can ask which ones.

Check the frame for rewiring too. Old cloth covered wire, cracked insulation or sockets with no earth connection should be redone before the fixture goes up, and that cost belongs in your offer. If you are not sure whether the ceiling can carry it, read how to tell if a chandelier is too heavy for your ceiling before you agree a price. Lead crystal drops add up quickly on a large fixture.

Online, you cannot hold anything, so the checks change. Ask the seller for a close photograph of one prism edge in side light and a photograph of the pins. I have a fuller list in what to check before buying a chandelier online.

Pricing what you find

I cannot give you a price table, because condition, maker and region matter too much. What I can tell you is the order of value most dealers I know would agree with: genuine cut lead crystal at the top, good K9 in the middle, moulded glass below that, and acrylic at the bottom. A large chandelier of cut lead crystal in good condition can cost several times more than an identical looking piece in pressed glass, which is exactly why the label matters.

Once it is home, a secondhand chandelier almost always needs a proper clean. Lead crystal dulls with grime and nicotine in a way that hides its quality, and it brightens dramatically afterwards. My method for doing it on the ceiling is in how to clean a crystal chandelier without taking it down.

Before you go to look at one

This week, put a small torch and a loupe in your bag or coat pocket, so they are with you whenever you look at a used chandelier. Practise once on any glass object you own: find a mould seam, tap it, shine light through it. The first time you see the difference between a moulded edge and a cut one, you will not forget it.