Ruby

Ruby properties at a glance

Geology & background

Forms in metamorphic rocks when aluminum-rich minerals are subjected to heat and pressure with trace chromium.

Called the 'King of Gems' in ancient India, rubies have been treasured for over 2,000 years.

How to identify Ruby

• Check whether the specimen's color and texture match typical Ruby examples.
• Photograph a fresh surface in natural light and avoid shadows, glare, or wet surfaces.
• Use hardness, streak, luster, grain size, and locality together; no single trait is enough for every specimen.

Where Ruby is found

Ruby is reported from multiple localities or geological settings. Exact locality should be verified from specimen provenance, maps, or field notes.

How much is Ruby worth?

Value depends on size, condition, color, crystal quality, locality, rarity, preparation, and provenance. Treat this as educational guidance, not an appraisal.

Common uses

• Jewelry
• Watches
• Lasers

Interesting facts

• The most valuable rubies are 'pigeon blood' red from Myanmar
• Rubies and sapphires are the same mineral, just different colors
• Ancient warriors implanted rubies in their skin for protection

Care & safety

Treat Ruby as a collector specimen unless hardness, cleavage, and fracture are confirmed.

Avoid inhaling dust. Do not cut, grind, or polish unknown specimens without eye protection and a properly rated respirator.

Related rocks & minerals

Sapphire Precious Stones Spinel Semi-Precious Stones Garnet Semi-Precious Stones Alexandrite Precious Stones Diamond Precious Stones Emerald Precious Stones