Quartz, Fluorite Pendants

Simple settings to best show off the mineral. Brazil and Mexico, £13.50 and £12.50.

Promicroceras Earrings

These pyritised ammonites have been carefully matched and set in silver. £44, Lyme Regis, England.

Eggshell Pendant

Shell from Saltasaurus eggs, from Rio Negro in Argentina, roughly 80 million years old. Dinosaur eggshell in silver pendant, Argentina, £18.50.

Ammonite Bracelet

Sectioned ammonites, 100 million years old, from Majunga in Madaagascar, £75 and £90.

Ammolite Ring

Ammolite is the mineralised mother-of-pearl from 65 million years old ammonite shells. It is a very rare gemstone.

£120, Alberta, Canada.

Ammolite Pendant

The colour in ammolite is rivalled only by the finest opals. £75 to £165, Alberta Canada.