Diamond and Sapphire
Carbon (Diamond) and Aluminium Oxide (Corundum var. Sapphire) · Precious Gemstone
Crystal System
Cubic (Isometric) for diamond; Trigonal for sapphire
Mineral Group
Native Elements (Diamond) and Oxides (Sapphire)
Chemical Formula
C (Diamond) and Al2O3 (Sapphire) with trace Fe and Ti for blue color
Formation Process
Diamond forms under high pressure and temperature in the Earth's mantle; sapphire forms in metamorphic and igneous rocks
About This Crystal
A faceted round brilliant-cut central gemstone exhibiting high brilliance, accompanied by smaller accent diamonds and deep blue transparent sapphires set in a precious metal ring
Physical Characteristics
Adamantine to greasy luster for diamond, vitreous for sapphire; white streak; no cleavage for diamond, parting for sapphire; specific gravity ~3.52 for diamond, ~4.00 for sapphire
Optical Properties
Singly refractive (isotropic) for diamond with high dispersion (fire); doubly refractive (anisotropic) for sapphire with dichroism
Hardness & Durability
Origin Region
Worldwide, notably South Africa, Russia, Australia, Canada, and Kashmir, Sri Lanka for sapphires
Hardness & Durability
Diamond is 10 on the Mohs scale, exceptionally durable; Sapphire is 9 on the Mohs scale
Care & Maintenance
Clean with warm soapy water and a soft brush, avoid harsh chemicals and sudden thermal shock
Rarity & Value
Precious gemstone, high value depending on the fourCs (carat, cut, color, clarity) of the center stone and quality of accent sapphires
Special Characteristics
Exceptional brilliance and dispersion in diamond; rich blue color and velvety appearance in fine sapphires
Lore & History
Diamond symbolizes eternity, strength, and invincibility; sapphire symbolizes wisdom, royalty, and divine favor