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Corundum family

Ruby and sapphire are gemstone varieties of corundum. Family membership organizes research but does not establish the origin or treatment of a specimen.

AI-assisted source review · 2026-10-16. No named gemologist review is claimed. How this reference was reviewed.

Yellow sapphire reference photograph, identified by the source.
Yellow sapphire reference photograph, identified by the source. Educational example; not KhyatiGems inventory and not an independent treatment or origin assessment.
Billjones94 · CC0 · Source · CC0

Species and varieties

Corundum is the mineral species that includes ruby and sapphire. Ruby describes the red variety; sapphire includes blue and other non-ruby colours. Yellow and blue sapphires are therefore researched within the same mineral family, while their appearance and descriptive questions may differ.

Similar underlying properties do not imply identical commercial descriptions or treatment histories. Keep family classification separate from the record of a particular stone.

Using the family reference

Begin with the individual variety page for the colour or phenomenon being discussed. Compare reference properties and treatment explanations, then check which questions have been examined for the stone being offered. A photograph alone cannot establish those conclusions.

When comparing corundum varieties, use consistent viewing conditions and ask for the same categories of information for both stones. A comparison is weaker when one description supplies a report and the other supplies only a name.

This overview is an organizing entry point rather than an identification service. Each variety page should carry sources, relevant care information and genuine reviewer attribution. Optical-effect and synthetic-material entries need their own research. Do not infer those details from a general family label or treat a reference photo as documentation for an unknown specimen.

Specimen examples

Educational examples do not indicate current availability for sale.

Blue sapphire reference photograph, identified by the source.
Blue sapphire reference photograph, identified by the source. Educational example; not KhyatiGems inventory and not an independent treatment or origin assessment.
PumpkinSky · CC BY-SA 3.0 · Source · CC BY-SA 3.0 · Displayed at responsive sizes; original source linked. Any adapted image remains under the source licence.
Ruby reference photograph, identified by the source.
Ruby reference photograph, identified by the source. Educational example; not KhyatiGems inventory and not an independent treatment or origin assessment.
W.carter · CC BY 4.0 · Source · CC BY 4.0 · Displayed at responsive sizes; original source linked. Any adapted image remains under the source licence.

Sources and further reading

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