Blue sapphire dating russian
The Modern Birthstone List is the official list from the American National Association of Jewelers, Jewelers of America.These gemstones were officially adopted in 1912 (tanzanite was added in October 2002). For at least 10,000 years, man has used colored stones as talismans and amulets.The bright reds and deep blues are spectacular specimens. It is easy to see how spinel can be confused with ruby and sapphire or used as an alternative stone.It is easy to understand how early gem traders confused spinel with ruby and sapphire for over 1000 years. These spinels are about 4 1/2 millimeters in size and weigh a little less than 1/2 carat each.It is valued for its vivid color, its excellent hardness (9 on the Mohs scale) and its rarity.Collectors and investors search out particularly fine specimens, which have historically increased in value over time.Spinel forms in the same rock units, under the same geological conditions and is found in the same gravels.
Red and blue spinel: Spinel occurs in a wide variety of colors.
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Blue sapphire colors range from pale blue to cornflower blue to royal blue, navy blue and midnight blue.
The main sources are Sri Lanka (Ceylon), Burma (Myanmar), Madagascar, Tanzania, Australia and Thailand.