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

TPZ700
TPZ700
0.30 ct. total, 'AA' Grade
3.0mm Round Cut
Dark
Moderately Strong Very Slightly Greenish Blue
Very Very Slightly Included
[R] Neutron irradiated and/or heat treated.
Only one pair available.
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
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
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
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
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
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
2.5mm
0.11 ct.
3mm
0.20 ct.
4mm
0.45 ct.
5mm
0.71 ct.
6mm
1.29 ct.
 
  AA
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
4mm
0.28 ct.
5mm
0.62 ct.
6mm
0.51 ct.
7mm
1.50 ct.
 
  AA
4x2mm
0.14 ct.
5x2mm
0.20 ct.
5x2.5mm
0.30 ct.
6x3mm
0.45 ct.
 
  AA
4x2x1.5mm
0.12 ct.
 
  AA
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
4mm
0.34 ct.
10mm
6.35 ct.
 
  AA
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
5x3mm
0.33 ct.
6x4mm
0.65 ct.
8x6mm
1.60 ct.
10x7mm
2.80 ct.
 
  AA
5mm
1.00 ct.
6mm
1.50 ct.
10mm
7.00 ct.
 
  AA
5mm
0.75 ct.
6mm
1.25 ct.
 
  AA
8x6mm
1.70 ct.
9x7mm
2.50 ct.
10x8mm
3.50 ct.
12x10mm
6.60 ct.
 
  AA
10x8mm
3.75 ct.
 
  AA
7mm
1.65 ct.
8mm
2.50 ct.
 
  AA
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
8x6mm
1.70 ct.
9x7mm
2.45 ct.
10x8mm
3.45 ct.