Two gemstones.
Side by side.

GEMSTONE ONE

Caledonite

Caledonite (Pb₅Cu₂(SO₄)₃(CO₃)(OH)₆), Mohs 2.5–3: an illustrated guide to crystal habit, identification, origins, collecting and safe care.

Colour & appearance

Deep blue, blue-green

Mineral family

Lead–copper carbonate sulfate hydroxide

Mohs hardness

2.5–3

Representative source regions

Scotland; United States; Chile

United States Chile

Jewellery & care

Primarily suited to enclosed specimen collections rather than everyday jewelry or loose handling. The GemHood picture is a generated educational illustration; it is not an authenticated specimen, laboratory result or sale item.

BlueBlue-green

Read the Caledonite 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.