Ruby with Diamonds
Corundum variety Ruby · Precious Gemstone
Crystal System
Trigonal; typically occurs as hexagonal prisms or rhombohedral crystals.
Mineral Group
Oxides (Hematite group)
Chemical Formula
Al2O3 with Cr (Chromium) trace elements for color
Formation Process
Metamorphic or Igneous; typically forms in aluminum-rich marble or basaltic rocks under high heat and pressure.
About This Crystal
A deep pinkish-red to blood-red gemstone. In this specific ring setting, the central ruby is flanked by faceted colorless stones, appearing transparent with a vitreous (glassy) luster.
Physical Characteristics
Color: Red; Streak: White; Cleavage: None (has parting); Fracture: Conchoidal to uneven; Specific Gravity: 3.97–4.05; Many rubies exhibit strong red fluorescence under UV light.
Optical Properties
Refractive Index: 1.762–1.770; Birefringence: 0.008–0.010; Pleochroism: Strong (purplish-red to orange-red); Uniaxial negative.
Hardness & Durability
Origin Region
Notable sources include Myanmar (Burma), Mozambique, Thailand, Sri Lanka, and Madagascar.
Hardness & Durability
Mohs Hardness: 9; Excellent toughness and durability; highly stable and suitable for daily wear in jewelry.
Care & Maintenance
Care: Warm soapy water or ultrasonic cleaners are generally safe for natural ruby. Avoid harsh chemicals. Some rubies are glass-filled and require extra care with heat and acids.
Rarity & Value
Very Rare (high quality); Value is determined by 'Pigeon Blood' color saturation, clarity, and size. Most commercial rubies are heat-treated to improve color.
Special Characteristics
Can show asterism (star ruby) or strong red fluorescence. Inclusions like 'silk' (rutile needles) can help identify natural origin.
Lore & History
Historically known as the 'King of Gems.' Symbolizes passion, protection, and prosperity. Associated with the Root Chakra and is the traditional birthstone for July.