Cassandra - necklace with black bicones, green onyx and gold-fired ceramic discs - Artisan necklace Translucent green onyx discs accent black lampwork bicones, with gilded ceramic disc beads. £35.00 If you would like to purchase an item similar to this one, please contact us. An elegant necklace with translucent green onyx accent beads and high-fired gold-dipped ceramic discs accenting handmade black glass bicone beads. The necklace illustrated measures approximately 17"/43cm. All necklaces from Tillerman Beads are created individually in the studio, using the best quality materials, including SoftFlex stringing wire, crimps and crimp covers and the best findings available.