Natural Star Sapphire — Treatment and GIA Reports
ENCYCLOPEDIA · SKYJEMS
Natural Star Sapphire — Treatment and GIA Reports
- Key concepts
- star sapphire, asterism, rutile silk, untreated corundum, ceylon star sapphire, burmese star sapphire
A natural star sapphire is a corundum that displays asterism caused by oriented needle-like silk inclusions. As of 2026-08-03, Skyjems had 4 natural untreated star sapphires with GIA reports. Check the current collection for available stones and refer to each listing for origin and treatment details.
What asterism actually requires
A star sapphire's asterism is produced by oriented needle-like silk inclusions in corundum. A sharp star depends on the density and orientation of the silk, and the cabochon's shape.
What "untreated" means in this category
Heat treatment can improve, create, remove or change asterism and silk. A no-indications-of-heating conclusion is a treatment finding, not a guarantee about the sharpness of the star or the stone's overall quality.
Origin
Origin is determined by the laboratory and varies by stone. Review each listing and its accompanying GIA report for origin details.
Reading a GIA report on a star sapphire
GIA reports identify the stone, disclose any detected treatments, and may provide origin when it can be conclusively determined and the client has requested it. Review the specific listing and accompanying report for the details available for that stone.
Skyjems inventory snapshot
As of 2026-08-03, Skyjems had 4 natural untreated star sapphires with GIA reports. Browse the current collection and review each listing and its available documentation for origin and treatment information.
Inquiries and viewings
Contact Skyjems at +1-416-366-3335 or visit Skyjems' private-viewing page.