gemstone
Star sapphire ring
Corundum (Al₂O₃), likely asteriated sapphire
AI-generated identification · may be incorrectThe dark blue cabochon shows a star-like optical effect, likely caused by aligned rutile inclusions (asterism). Corundum has Mohs hardness 9, vitreous luster, and a trigonal crystal structure; the ring’s metal setting is not geological material.
Identified More gemstone →
Explore Star sapphire ring in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
The dark blue cabochon shows a star-like optical effect, likely caused by aligned rutile inclusions (asterism). Corundum has Mohs hardness 9, vitreous luster, and a trigonal crystal structure; the ring’s metal setting is not geological material.
Formation & geological history
Sapphires form in aluminum-rich rocks or alluvial deposits through geological processes that vary by locality; natural corundum ranges from ancient to geologically recent deposits. The image alone cannot establish whether this stone is natural or synthetic.
Uses & applications
Sapphires are used in jewelry and, synthetically, in watches and industrial components.
Geological facts
Asterism is most visible under a focused light source and is commonly displayed in cabochon-cut stones.
Field identification & locations
The image is consistent with a star sapphire, but identification and natural-versus-synthetic origin require gemological testing. Sapphires occur in places including Sri Lanka, Myanmar, Madagascar, and Australia.
More like this
Other gemstone specimens
Gemstone Ring
N/A - Set piece of jewelry, likely Amethyst or Garnet with Diamond or CZ
gemstone
Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Topaz
Al2SiO4(F,OH)2
mineral
Amber
Succinite (Organic Gemstone)
mineral
Diamond and Gold Jewelry
Carbon (Diamond) / Au (Gold)
gemstone
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary