| Description | Notes | |
|---|---|---|
| EN | Mother-of-pearl | (es: ‘nácar’) |
| FR | Nacre | Le « nácar » espagnol |
| ES | Nácar | (es: ‘nácar’) |
List 99 · Special cover material
21 — Mother-of-pearl
<!-- ONIX snippet not yet curated for codelist 99 (value: 21) -->- Introduced in Issue 6