Two gemstones.
Side by side.

GEMSTONE ONE

Thomsonite-Ca

Thomsonite-Ca: Radiating zeolite aggregates and distinctive concentric banding in some polished nodules. A concise guide to properties, responsible collecting, provenance...

Colour & appearance

Cream, white, pink, pale yellow or brown

Mineral family

Calcium-dominant zeolite; thomsonite subgroup

Mohs hardness

5–5.5

Representative source regions

United Kingdom; United States; Portugal

United Kingdom United States Portugal

Jewellery & care

Can be polished as a protected collectible; verify stability before any pendant use. Strong colours and a specimen’s mineralogical interest do not make it a commercially graded facetable gemstone.

CreamWhitePinkYellow

Read the Thomsonite-Ca 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.