Stone 10 · Gemstone guide
Spinel
Natural spinel
Spinel is a distinct mineral species that occurs in red, pink, blue, violet, grey and many other colours. Historic red spinels were sometimes recorded as rubies before modern gemology separated the two minerals.
Gemological register
- Mineral
- Spinel
- Composition
- Magnesium aluminium oxide
- Crystal system
- Cubic
- Mohs hardness
- 8
- Refractive index
- Commonly about 1.718
- Specific gravity
- Commonly about 3.58 to 3.61
Colour
Colour is a range, not a shorthand.
Trace elements produce reds, pinks, oranges, blues, violets and neutral tones. Grey modifiers, fluorescence and tone can change the apparent colour across lighting conditions.
Clarity and character
Read inclusions in context.
Crystals, fingerprints and growth features may occur. Spinel is singly refractive, and its internal features can help distinguish natural material from synthetic counterparts.
Treatment disclosure
Ask what changed and how it was detected.
Many spinels are unheated, but heat and fracture filling have been reported. Synthetic spinel is widely available, so natural origin and any detectable treatment should be stated rather than assumed.
Setting practice
The mount answers the material.
Spinel is suitable for varied settings when inclusions and girdle condition are understood. Pressure should be distributed evenly and vulnerable corners protected.
Care
Care follows the individual record.
Warm water, mild soap and a soft brush are the safest routine choice. Avoid sudden heat, hard impact and powered cleaning when fractures or filling are present.
Sourcing questions
Questions worth carrying to the desk.
- 01Is the spinel natural or synthetic?
- 02Has heat or any clarity enhancement been detected?
- 03Are colour and origin statements supported by a laboratory report?
- 04Which internal features matter to the proposed setting?
Kundali note
Spinel is not one of the standard nine materials in most Navratna lists, although red spinel has historical associations with ruby. Design use alone does not constitute a Jyotish recommendation.
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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