Two gemstones.
Side by side.

GEMSTONE ONE

Chabazite-Ca

Chabazite-Ca guide: identity, composition Ca₂Al₄Si₈O₂₄·13H₂O, hardness 4–5, origins, collecting and care.

Colour & appearance

Colourless, white, yellowish, pale pink or salmon

Mineral family

calcium-dominant zeolite mineral

Mohs hardness

4–5

Representative source regions

Italy; Canada; Iceland; India

Italy Canada Iceland India

Jewellery & care

Zeolite collectors value well-formed crystals; its brittleness and good cleavage make jewellery use impractical.

ColourlessWhitePink

Read the Chabazite-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.