Two gemstones.
Side by side.

GEMSTONE ONE

Olivenite

Discover Olivenite, a copper arsenate — olivenite group known for olive-green arsenate prisms. See verified-reference properties and specimen care advice.

Colour & appearance

Olive-green to yellow-green or grey-green and brownish shades

Mineral family

Copper arsenate — olivenite group

Mohs hardness

3

Representative source regions

Carharrack Mine in Cornwall, England (type locality); other oxidised copper–arsenic deposits

Jewellery & care

Display specimens only; soft crystals and chemical risk make it unsuitable for jewelry.

Green

Read the Olivenite guide

GEMSTONE TWO

Sapphire

Sapphire is a gem variety of corundum, often associated with blue but also found in other colours. Its hardness makes it an enduring jewellery material, although the secu...

Colour & appearance

Blue and other colours

Mineral family

Corundum (Al₂O₃)

Mohs hardness

9

Representative source regions

Sri Lanka, Madagascar, Myanmar, Australia, Thailand and Montana in the United States are recognised sources. The Kashmir region is historically famous for highly valued blue sapphires.

Sri Lanka Madagascar Myanmar Australia Thailand United States

Jewellery & care

Choose the style and setting to suit the specific stone, treatment information and intended use.

Blue

Read the Sapphire guide

Hardness measures scratch resistance, not breakage. Source regions are educational examples, not claims about the provenance of an individual GEMHOOD product. Images may be digital gemstone illustrations.