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facts
properties of sapphire
- Belongs mineralogically to corundum
- Hardness grade 9
- Chemical formula: Al2O3
- Includes all colors except red, red corundum is called “ruby
- Coloration generally by metal oxides (e.g. blue: titanium oxide)
- High density of 3.9 – 4.1
worth knowing
- Oldest known locality: Burma
- The legendary place of discovery: “Kashmir”
- Assigned to the planet Saturn
- Besides blue, pink sapphire is especially sought after: “hot pink”.
- The most recently discovered localities are Madagascar and Ethiopia
investment in sapphire
- second most suitable of all gemstones for investment
- less rare than ruby but also strongly increasing in value
- Stones should have at least 1 ct weight, better from 3 ct.
- larger stones have higher increase in value
- Experts reckon with 6% increase in value per year
- beautiful sparkling sapphires are preferable
