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Perl
 | |
| Math | cynnyrch anifeiliaid, glain organig, spherical body  |
|---|---|
| Deunydd | nacr |
 Ffeiliau perthnasol ar Gomin Wicimedia | |
- Gweler hefyd: Perl (gwahaniaeth).
Peth sfferigol caled yw perl a gaiff ei greu o fewn mantell molwsg cragennog. Caiff perl ei gyfansoddi o galsiwm carbonad ar ffurf crisialog mân, yr un peth a thu mewn y gragen.
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