Dendrite

Dendrite

Derbyshire Blue John

derbyshire blue john vase with lid on display in London's Natural History Museum

Duke of Devonshire Emerald

large question mark adjacent to a smaller faceless figure who's wondering about the answer to a question

Ephod

Ephod

Etheric Body

etheric_body

Gemmy

image of a translucent faceted gemstone

Gemstones

a collection of faceted coloured gemstones

Geode

question mark page explains what a geode is

Goldstone Man-Made Gemstone

goldstone oval shaped cabochon

Guide to Birthstones

three coloured birthstones

Heat Treatments in Relation to Stones

large red questions mark adjacent to a small faceless figure who's gesticulating that he's wondering about the answer to a question

Heliotrope

heliotrope_aka_bloodstone

How to Care for Silver and Gemstone Jewellery

silver polishing cloth in front of the plastic packet in which it was wrapped

Igneous Rocks

igneous rock

Inclusions

inclusions

Iridescence

Iridescence

Iron

rough chunk of iron article talks about this mineral

Iron Ore

iron ore

Iron Oxides

iron_oxides

Lava

Lava

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