These unusual fossil shells are all found in the same areas in conjunction with several other types of ammonites including kosmoceras, rondiceras, hectioceras, bentatisphinctes, breghtia and cadoceras. These fossils resemble each other fairly closely although there are slight differences. The kosmoceras (or cosmoceras) can be smooth or bumpy on the exterior shell; the rondiceras is more rounded and three-dimensional.  The bentatisphinctes, hectioceras and breghtia are very similar in looks. 

The quenstedoceras fossils range in size from very small to almost 5 inches across.  The shells resemble each other in that they all have a white or pink colored iridescent shell.  Sometimes this shell has come off, leaving an iron pyrite layer underneath.  The iron pyrite layer or fool’s gold as it is more commonly called is heavy; it gives the fossil its heavy feeling.  Sometimes the iridescent shell is polished away to show off the pyrite underneath.  On other occasions the pieces are cut in half to show the inner chambers.  These chambers sometimes have pyrite crystals inside and are extremely beautiful and rare.  On occasion we make these pieces into jewellery. The age of these fossil shells is approximately 135 million to 195 million years old.

All of these fossil shells are very rare; they may also be fragile.  A lot of time and effort goes into cleaning these pieces for display. 

  • Set in sterling silver.
  • Dimensions:
    • Gemstone with setting: 26 mm x 20 mm x 7 mm
    • Bail length: 11 mm
  • Features a genuine stone.
  • This item includes an information card.
  • A certificate of authenticity is included with this item.

This stone requires special care - exposure to water and other chemicals, such as lotions or perfumes, will damage it over time. If you polish the jewellery, avoid polishing the stone itself. A silver-cleaning dip should never be used with this piece.

*Sterling silver chain is not included. It is available for purchase here.

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