Stone 05 · Gemstone guide
Yellow Sapphire
Pukhraj · Pushparaga
Yellow sapphire is yellow corundum. Trace elements and colour centres contribute to its hue, while corundum's hardness makes it suitable for many jewellery forms when its individual features are understood.
Gemological register
- Mineral
- Corundum
- Composition
- Aluminium oxide
- Crystal system
- Trigonal
- Mohs hardness
- 9
- Refractive index
- About 1.762 to 1.770
- Specific gravity
- About 4.00
Colour
Colour is a range, not a shorthand.
The range includes pale yellow, lemon, golden and orangy yellow. Cut and colour zoning can concentrate or dilute the colour seen through the face of the stone.
Clarity and character
Read inclusions in context.
Natural crystals, needles, healed fissures and colour zones may occur. Eye-visible clarity should be read alongside colour, cut and any feature that could affect setting pressure.
Treatment disclosure
Ask what changed and how it was detected.
Heat and diffusion can modify yellow colour. Irradiation and other colour treatments are also encountered, so the exact laboratory conclusion should accompany any material claim.
Setting practice
The mount answers the material.
A bezel or claws should protect the girdle and avoid concentrated pressure over inclusions. The finished seat must allow the stone to be examined without unnecessary dismantling.
Care
Care follows the individual record.
Routine hand cleaning with mild soapy water is suitable for many stones, but treatment and fracture condition govern whether steam or ultrasonic cleaning can be considered.
Sourcing questions
Questions worth carrying to the desk.
- 01Is the colour natural or treated?
- 02What treatment language appears on the laboratory record?
- 03Does the stone show colour zoning in normal viewing positions?
- 04Are origin statements supported by independent examination?
Kundali note
Yellow sapphire is traditionally associated with Guru or Brihaspati in Jyotish. Its inclusion in a piece follows a private chart consultation and carries no guaranteed outcome.
Traditional association and gemological assessment remain distinct parts of a conversation. No material is presented as an outcome guarantee.
Read the consultation process →Individual assessment
Ask about a stone, setting or record.
Bring the object, report language or sourcing question you want to study. The next step is a direct conversation.
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