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This unusual pendant is based on the coral Astrocyathus. Astrocyathus, or Deltocyathus as it is now known, is a star coral with 6-fold symmetry that is related to the sea anemones. Star corals are an important group of reef builders due to their ability to secrete a calcite skeleton from their soft bodies. The jewelry recreates the calcite skeleton left behind by this organism as drawn by Prof. Ernst Haeckel.

The bronze, brass and silver jewelry is created by 3D-printing in wax followed by metal casting in solid bronze, solid brass or solid sterling silver. They are lightly polished after casting to give it a smooth glossy texture. The gold-plated stainless steel is created by 3D-printing followed by bronze infusion and baking in a kiln, and finally, plated in gold.
To prevent waste and overstock, the jewelry is not made until you order. Please allow 3-4 weeks for printing and shipping. All items are gift-wrapped in original, recyclable Ontogenie packaging and then shipped insured by registered mail, worldwide.

The pendant will be shipped with a rose gold-plated, gold-plated or non-plated sterling silver anchor chain depending on whether you order the bronze, brass, gold-plated steel or silver pendant.

The pendant is slightly larger than 3cm in diameter.

Frequently asked questions about Ontogenie

All of my designs are achieved by 3D-printing combined with lost wax casting. If I have the piece you want in stock, I can usually ship it the next day. If it isn't in stock, please allow 3 weeks for printing until I can ship it.
Are you fond of an organism, but don't see it in my collection? Let me know, I look forward to hearing from you. ontogenie3d@gmail.com
All of my pieces are gift wrapped in Ontogenie recycled paper boxes containing shredded wood and finished with twine.

Coral Astrocyathus pendant - marine biology - science jewelry in bronze, brass & silver


Only 1 available


  • Handmade item
  • Materials: silver, bronze, brass, gold plated steel
  • Made to order
  • Ships worldwide from Germany
  • Feedback: 35 reviews
  • Favorited by: 32 people