Mixed Sapphire and Ruby (Multi-colored Corundum)
Corundum var. Sapphire and Corundum var. Ruby · Precious Gemstone / Jewelry Beads
Crystal System
Trigonal (Hexagonal scalenohedral); these beads are cut into a faceted geometric 'star' or 'nugget' habit.
Mineral Group
Oxides (Hematite group)
Chemical Formula
Al2O3 (Aluminum Oxide) with trace elements: Chromium (Red), Iron/Titanium (Blue), Iron (Yellow/Green)
Formation Process
Metamorphic or Igneous; forms in alumina-rich and silica-poor environments at high temperatures and pressures.
About This Crystal
A strand of faceted geometric beads exhibiting a range of opaque to translucent colors including blue, pink, deep red, teal, and grey-lavender. The luster is sub-vitreous to waxy due to the lower grade/opacity.
Physical Characteristics
Color: Multi-colored; Streak: White; Fracture: Conchoidal to splintery; Specific Gravity: 3.98–4.06; Fluorescence: Rubies (pink/red beads) often show strong red fluorescence under UV.
Optical Properties
Refractive Index: 1.762–1.770; Birefringence: 0.008; Uniaxial negative; Pleochroic; these specimens are mostly opaque showing no internal fire.
Hardness & Durability
Origin Region
Likely Madagascar, Thailand, or India; typically found in alluvial deposits or metamorphic marbles/schists.
Hardness & Durability
Mohs Hardness: 9 (Hardest mineral after Diamond); Toughness: Excellent (though brittle if heavily included); highly durable for daily jewelry wear.
Care & Maintenance
Clean with warm soapy water and a soft brush; safe for ultrasonic unless heavily fractured. Avoid harsh chemicals and sudden thermal shock.
Rarity & Value
Common (Commercial Grade); these are industrial or low-grade opaque corundum beads. Value is relatively low compared to transparent faceted gems, usually $20-$60 per strand.
Special Characteristics
Opaque corundum often exhibits 'silk' (rutile inclusions). Some beads may show a faint chatoyancy or 六方 (six-sided) growth patterns visible on their faceted faces.
Lore & History
Historically worn by royalty as a symbol of power and protection. Red corundum (ruby) is associated with the Root Chakra and vitality; blue (sapphire) with the Throat/Third Eye and wisdom.