Two gemstones.
Side by side.

GEMSTONE ONE

Pentagonite

Discover Pentagonite, a hydrated calcium–vanadium silicate known for sky-blue vanadium silicate sprays. See verified-reference properties and specimen care advice.

Colour & appearance

Greenish blue to striking sky blue

Mineral family

Hydrated calcium–vanadium silicate

Mohs hardness

3–4

Representative source regions

Owyhee Dam, Oregon, USA (type locality); Wagholi quarries near Pune, India

India

Jewellery & care

Delicate crystalline sprays are for display rather than high-wear jewelry.

BlueSky Blue

Read the Pentagonite 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.