| pearl (scientific name: pinctada fucata) 2.84 g, black onyx: 3.4 g, mother of pearl shell (scientific name: nacre) 3.6 g, abalone shell (scientific name: haliotidae) 2.1 g, imitation opal: 2.2 g |
| pearl (scientific name: pinctada fucata) 2.84 g, black onyx: 3.4 g, mother of pearl shell (scientific name: nacre) 3.6 g, abalone shell (scientific name: haliotidae) 2.1 g, imitation opal: 2.2 g |