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Home > Gemstones (loose) > Topaz > London Blue Topaz londonbluetopaz.51 carat Barrel cut Code:1LBT0604BR00CH Price:$6.00 londonbluetopaz1.01 carat Barrel cut Code:1LBT0705BR00CH Price:$9.00 londonbluetopaz1.58 carat Barrel cut Code:1LBT0806BR00CH Price:$13.00 londonbluetopaz2.35 carat Barrel cut Code:1LBT0907BR00CH Price:$18.00 londonbluetopaz1.43 carat Barrel cut Code:1LBT1005BR00CH Price:$12.00 londonbluetopaz3.35 carat Barrel cut Code:1LBT1008BR00CH Price:$24.00 londonbluetopaz4.45 carat Barrel cut Code:1LBT1109BR00CH Price:$31.00 londonbluetopaz2.38 carat Barrel cut Code:1LBT1206BR00CH Price:$18.00 londonbluetopaz3.88 carat Barrel cut Code:1LBT1407BR00CH Price:$27.00 londonbluetopaz.67 carat Cushion cut Code:1LBT0505AC00CH Price:$7.00 londonbluetopaz.67 carat Cushion cut Code:1LBT0505ACCBCH Price:$7.00 londonbluetopaz.62 carat Cushion cut Code:1LBT0604CU00CH Price:$7.00 londonbluetopaz.62 carat Cushion cut Code:1LBT0604CUCBCH Price:$7.00 londonbluetopaz1.1 carat Cushion cut Code:1LBT0606AC00CH Price:$10.00 londonbluetopaz1.1 carat Cushion cut Code:1LBT0606ACCBCH Price:$10.00 londonbluetopaz1.15 carat Cushion cut Code:1LBT0705CU00CH Price:$10.00 londonbluetopaz1.15 carat Cushion cut Code:1LBT0705CUCBCH Price:$10.00 londonbluetopaz1.74 carat Cushion cut Code:1LBT0707AC00CH Price:$14.00

Topaz Properties Composition Al2(F,OH)2SiO4 Refractive Index 1.609-1.643 Hardness: 8 Mohs Specific Gravity: 3.49-3.57 Typical Cutting Style: faceted Optic Character: DR, biaxial positive Polish Luster: Vitreous Cause of Color: Chromium Cleavage: Perfect in one direction Typical Size Range: 5 to 25 ct; faceted stones over 2000 ct have been cut for museums Public Recognition: Well Known Birefringence: 0.008 to 0.010 Dispersion: . .014 Pleochroism: Yellow: definite; lemon-honey, straw-yellow Fracture: Conchoidal, uneven Reaction to Heat Rapid heating or cooling will cause internal breaks: strong heat may alter or destroy color Stability to Light:  Stable, some brown topaz may fade Birthstone: November Anniversary: Year 4th Astrological Stone: Sagittarius Cleaning:   Ultrasonic Never Steamer Never Soapy Warm Water Safe

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