London Blue Topaz Gemstones

  • Hardness

    8.0 on the Mohs scale.

  • Occurrence

    Brazil, U.S., Sri Lanka (Ceylon), Myanmar (Burma), former USSR, Australia, Pakistan, Mexico, Tasmania, Japan, Africa. Topaz and citrine are the birthstones of the month of November.

  • Appearance

    London blue topaz is generally the darkest shade of the blue topaz, and are very striking gemstones. Most blue topaz is irradiated and heat treated silver topaz, although it is sometimes found naturally.

  • Enhancements

    Blue topaz is usually irradiated and often heated to produce blue color.

    More information on gemstone enhancements.

  • Gemstone Family

    London Blue Topaz is a member of the Precious Topaz gemstone family.

London Blue Topaz
London Blue Topaz

TPZ680
TPZ680
 3.71 ct.
9.0mm Round Cut
Medium Dark
Strong Green-Blue
Loupe Clean
[R] Neutron irradiated and/or heat treated.
Quantity Available: 4
London Blue Topaz

TPZ702
TPZ702
 1.97 ct., 'AA' Grade
8.0x6.0mm Emerald Cut
Dark
Moderately Strong Very Slightly Greenish Blue
Very Very Slightly Included
[R] Neutron irradiated and/or heat treated.
One of a kind.
London Blue Topaz

TPZ471
TPZ471
 2.38 ct. total
6.0mm Square (Step) Cut
Medium
Strong Very Strongly Greenish Blue
Loupe Clean
[R] Neutron irradiated and/or heat treated.
Only one pair available.
London Blue Topaz

TPZ470
TPZ470
 0.94 ct.
6.0mm Heart Shape
Medium Dark
Strong Very Strongly Greenish Blue
Loupe Clean
[R] Neutron irradiated and/or heat treated.
Quantity Available: 2
London Blue Topaz

Calibrated London Blue Topaz
Calibrated London Blue Topaz

Specify size, shape and quality when ordering. Prices are subject to change without notice. Actual carat weight may vary from the average carat weight listed.

  • AA Eye clean, medium dark, fine brilliance, good cut.

London Blue Topaz Quality AA
Shape Size Avg. Weight Price Each
Round CutRound Cut
1mm
0.006 ct.
1.25mm
0.01 ct.
1.5mm
~
1.75mm
0.03 ct.
2mm
0.04 ct.
2.5mm
0.09 ct.
3mm
0.14 ct.
3.5mm
0.22 ct.
4mm
0.30 ct.
4.5mm
0.45 ct.
5mm
0.55 ct.
5.5mm
0.80 ct.
6mm
0.98 ct.
6.5mm
1.26 ct.
7mm
1.57 ct.
8mm
2.22 ct.
9mm
3.28 ct.
10mm
4.64 ct.
11mm
6.85 ct.
 
  AA
Oval CutOval Cut
5x3mm
0.30 ct.
6x4mm
0.58 ct.
7x5mm
0.99 ct.
8x6mm
1.57 ct.
9x7mm
2.40 ct.
10x8mm
3.60 ct.
11x9mm
4.20 ct.
12x10mm
6.00 ct.
14x10mm
7.50 ct.
14x12mm
10.60 ct.
16x12mm
11.00 ct.
 
  AA
Pear CutPear Cut
5x3mm
0.26 ct.
6x4mm
0.50 ct.
7x5mm
0.85 ct.
8x5mm
1.00 ct.
8x6mm
1.40 ct.
9x6mm
1.50 ct.
10x7mm
2.35 ct.
12x8mm
3.05 ct.
14x9mm
5.75 ct.
15x10mm
7.25 ct.
 
  AA
Marquise CutMarquise Cut
4x2mm
0.11 ct.
6x3mm
0.25 ct.
8x4mm
0.66 ct.
10x5mm
1.33 ct.
12x6mm
1.98 ct.
14x7mm
3.40 ct.
15x7mm
3.48 ct.
 
  AA
Emerald CutEmerald Cut
5x3mm
0.25 ct.
6x4mm
0.53 ct.
7x5mm
0.99 ct.
8x6mm
1.57 ct.
9x7mm
2.47 ct.
10x8mm
3.01 ct.
11x9mm
5.80 ct.
12x10mm
5.01 ct.
14x10mm
9.52 ct.
 
  AA
Square (Step) CutSquare (Step) Cut
2.5mm
0.11 ct.
3mm
0.20 ct.
4mm
0.45 ct.
5mm
0.71 ct.
6mm
1.29 ct.
 
  AA
Heart ShapeHeart Shape
4mm
0.32 ct.
5mm
0.57 ct.
6mm
1.00 ct.
7mm
1.60 ct.
8mm
2.30 ct.
9mm
2.99 ct.
10mm
4.00 ct.
 
  AA
Trillion CutTrillion Cut
4mm
0.28 ct.
5mm
0.62 ct.
6mm
0.51 ct.
7mm
1.50 ct.
 
  AA
Straight Baguette CutStraight Baguette Cut
4x2mm
0.14 ct.
5x2mm
0.20 ct.
5x2.5mm
0.30 ct.
6x3mm
0.45 ct.
 
  AA
Tapered Baguette CutTapered Baguette Cut
4x2x1.5mm
0.12 ct.
 
  AA
Princess CutPrincess Cut
3mm
0.18 ct.
3.5mm
0.28 ct.
4mm
0.40 ct.
4.5mm
0.57 ct.
5mm
0.80 ct.
5.5mm
1.10 ct.
6mm
1.38 ct.
6.5mm
1.65 ct.
 
  AA
Cabochon, Round CutCabochon, Round Cut
4mm
0.34 ct.
10mm
6.35 ct.
 
  AA
Cabochon, Oval CutCabochon, Oval Cut
5x3mm
0.40 ct.
6x4mm
0.75 ct.
7x5mm
1.15 ct.
8x6mm
1.70 ct.
9x7mm
2.90 ct.
10x8mm
4.15 ct.
14x10mm
9.00 ct.
 
  AA
Cabochon, Pear CutCabochon, Pear Cut
5x3mm
0.33 ct.
6x4mm
0.65 ct.
8x6mm
1.60 ct.
10x7mm
2.80 ct.
 
  AA
Cabochon, Square CutCabochon, Square Cut
5mm
1.00 ct.
6mm
1.50 ct.
10mm
7.00 ct.
 
  AA
Antique CutAntique Cut
5mm
0.75 ct.
6mm
1.25 ct.
 
  AA
Antique Cushion CutAntique Cushion Cut
8x6mm
1.70 ct.
9x7mm
2.50 ct.
10x8mm
3.50 ct.
12x10mm
6.60 ct.
 
  AA
Roll Top CutRoll Top Cut
10x8mm
3.75 ct.
 
  AA
Round, Checkerboard Top CutRound, Checkerboard Top Cut
7mm
1.65 ct.
8mm
2.50 ct.
 
  AA
Antique, Checkerboard Top CutAntique, Checkerboard Top Cut
5mm
0.75 ct.
6mm
~
7mm
1.75 ct.
8mm
2.90 ct.
9mm
3.60 ct.
10mm
5.50 ct.
12mm
9.60 ct.
 
  AA
Antique Cushion, Checkerboard Top CutAntique Cushion, Checkerboard Top Cut
8x6mm
1.70 ct.
9x7mm
2.45 ct.
10x8mm
3.45 ct.

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