Most Valuable Birthstones, From Least to Most Expensive
Peridot (Aug) avg. $500/kg; most exp. $18K. Value depends on cut & quality. Current info from Gemval.
Amethyst signifies the month of February. Average cost: $600/kg The most costly amethyst is between $300,000 to $400,000.
Topaz signifies the month of November. Average price per kilogram: $24,000; most costly topaz: $148,800
January is represented by garnet. Average price per kilogram: $400,000; most costly garnet: $316,000
Emerald signifies the month of May. Average price per kilogram: $500,000; most costly emerald: $5.5 million
October is represented by opal.Average price per kilogram: $700,000.The most costly opal is worth $1 million.
Aquamarine signifies the month of March. The average price per kilogram is $750,000.The most costly aquamarine is worth $1.5 million.
Tanzanite signifies the month of December. Average price per kilogram: $1,000,000 The most expensive tanzanite: $3.3 million
Sapphire signifies the month of September.Average price per kilogram: $1,750,000; most expensive sapphire: $6.7 million
Ruby signifies the month of July. Average price per kilogram: $3,500,000; most expensive ruby: $14.2 million
Alexandrite signifies the month of June. Average price per kilogram: $5,000,000; most costly alexandrite: $100,000
April is represented by the month diamond.Average price per kilogram: $6,000,000; most costly diamond: $71.2 million