Read the stamp
How to identify lead crystal
With lead crystal identification, a ring when tapped, heavy feel or rainbow reflection is not a direct measurement of lead.
Lead oxide and optical effects
Lead glass has optical properties that suit polished cutting and brilliant facets. The Corning Museum’s dictionary describes lead glass as containing at least 20% lead oxide in the batch. Trade and legal crystal categories can use their own definitions.
What to check next
Read a surviving percentage label and compare the named maker and model. A ring when tapped, heavy feel or rainbow reflection is not a direct measurement of lead. A glass object can be cut and polished without being lead crystal.
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