Composition: Aluminum oxide
Nomenclature: Named after the Sanskrit word kuruvinda which means "ruby."
Industrial Uses: Abrasives, gemstones, precision bearings.
Additional Notes: The blue variety of corundum is sapphire. The red variety is ruby. The colorless variety is leucosapphire.
Afghanistan : Scott 1300 : 40 afghani : 5 Dec 1988
Ruby (corundum)
Australia : Scott 562 : 10 cents : 16 Oct 1974
Sapphire (corundum)
Burma/Myanmar : Scott 306 : 50 pyas : 26 Jan 1991
Ruby (corundum)
Comoro Islands : Scott 930a : 375 francs : 1998
Ruby (corundum)
Kenya : Scott 110 : 10 shillings : 13 Dec 1977
Sapphire (corundum)
Kenya : Scott 111 : 20 shillings : 13 Dec 1977
Ruby (corundum)
Sri Lanka : Scott 507 : 60 cents : 16 Jun 1976
Sapphire (corundum)
Sri Lanka : Scott 509 : 2 rupees : 16 Jun 1976
Sapphire (corundum)
Sri Lanka : Scott 510 : 5 rupees : 16 Jun 1976
Ruby (corundum)
Thailand : Scott 624 : 75 stang : 7 Jun 1972
Ruby (corundum); quartz
Thailand : Scott 625 : 2 baht : 7 Jun 1972
Sapphire (corundum); quartz
Thailand : Scott 627 : 6 baht : 7 Jun 1972
Sapphire (corundum)
Tanzania : Scott 311 : 2 shilling : 22 May 1986
Sapphire (corundum)
Tanzania : Scott 314 : 30 shilling : 22 May 1986
Ruby (corundum)