• Hardness

  6.5.

• Occurrence

  Zoisite occurs in Tanzania (tanzanite) and Kenya, Norway, Austria, Western Australia, Italy, USA (North Carolina)

• Appearance

  Tanzanite, colored by Vanadium, is normally heat treated to bring out the intense purple, blue and greyish colors. The color seen depends on the angle they are viewed from. Under incandescent lighting, they can appear more violet. Can be confused with iolite. Tanzanite is also produced synthetically, and a new treatment of beryl produces a dark blue beryl that is very similar in color to tanzanite.

• Enhancements

  Tanzanite is usually heat treated to produce violet-blue color.

  More information on gemstone enhancements.

  Violet-Blue Tanzanite is the result of heat-treatment, as the following photo illustrates:

  

• Tanzanite

  • Item #TNZ192
    	0.24 ct. total
    	3.0mm Round Cut
    	Light
    	Strong Bluish Violet
    	Loupe Clean
    	[H] Heated to improve color.
    	Quantity Available: 1 pairs
    Tanzanite	$ 134.99/pair

  • Item #TNZ195
    	0.33 ct.
    	4.0mm Round Cut
    	Light
    	Strong Bluish Violet
    	Loupe Clean
    	[H] Heated to improve color.
    	one of a kind
    Tanzanite	$ 59.99

  • Item #TNZ205
    	0.18 ct.
    	3.5mm Round Cut
    	Light
    	Vivid Violetish Blue
    	Loupe Clean
    	[H] Heated to improve color.
    	one of a kind
    Tanzanite	$ 62.00

  • Item #TNZ203
    	0.96 ct.
    	7.1x4.8mm Oval Cut
    	Medium Dark
    	Vivid Violetish Blue
    	Loupe Clean
    	[H] Heated to improve color.
    	one of a kind
    Tanzanite	$ 1,844.99

  • Item #TNZ111
    	4.11 ct.
    	14.0x7.9mm Pear Cut
    	Medium Dark
    	Strong Bluish Violet
    	Flawless
    	[E] Routinely enhanced.
    	one of a kind
    Tanzanite	$ 3,304.99

  • Item #TNZ181
    	1.80 ct.
    	9.0x6.7mm Pear Cut
    	Medium
    	Vivid Violet
    	Loupe Clean
    	[E] Routinely enhanced.
    	one of a kind
    with Greenish Yellow
    Bi-Color Tanzanite	$ 889.99

• Calibrated Tanzanite

  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.

  • AAA Clean, medium dark bluish purple, brilliant, excellent cut and polish, no color zoning..
  • AA Clean, medium dark, bluish purple, good cut, good polish, good brilliance, little or no color zoning.
  • A Clean, medium light, bluish purple, good cut, good polish, good brilliance, little or no color zoning.

  Tanzanite		Quality	AAA	AA	A
  Shape	Size	Avg. Weight	Price Each
  Round Brilliant	2mm	0.04		$ 11	$ 6
  	2.25mm	0.05	$ 16	$ 14	$ 9
  	2.5mm	0.07	$ 23	$ 20	$ 11
  	2.75mm	0.08	$ 28	$ 27	$ 21
  	3mm	0.12	$ 42	$ 36	$ 23
  	3.25mm	0.14	$ 51	$ 46	$ 32
  	3.5mm	0.19	$ 69	$ 56	$ 43
  	3.75mm	0.20	$ 95	$ 74	$ 53
  	4mm	0.23	$ 119	$ 102	$ 83
  	4.25mm	0.33	$ 185	$ 130	$ 101
  	4.5mm	0.37	$ 218	$ 170	$ 135
  	4.75mm	0.41	$ 329	$ 253	$ 201
  	5mm	0.52	$ 393	$ 375	$ 266
  	5.5mm	0.59	$ 666	$ 555	$ 413
  	6mm	0.87	$ 1,304	$ 961	$ 804
  	6.5mm	1.15	$ 1,490	$ 1,288	$ 1,028
  	7mm	1.29		$ 1,445
  Oval	4x3mm	0.18	$ 61	$ 56	$ 37
  	4.5x3mm	0.21			$ 41
  	5x3mm	0.23	$ 110	$ 88	$ 70
  	5x3.5mm	0.30	$ 143	$ 105	$ 81
  	5x4mm	0.35	$ 234	$ 162	$ 123
  	5.5x4mm	0.38	$ 234
  	6x4mm	0.48	$ 364	$ 262	$ 202
  	6x5mm	0.59	$ 676	$ 397	$ 362
  	6.5x4.5mm	0.64	$ 610	$ 424	$ 330
  	6.5x5mm	0.75		$ 504
  	6.5x5.5mm	0.81	$ 771	$ 585
  	7x5mm	0.82	$ 1,047	$ 735	$ 529
  	7x5.5mm	0.93	$ 976	$ 834
  	7.5x5.5mm	1.04	$ 1,188	$ 860	$ 655
  	8x6mm	1.31	$ 1,685	$ 1,339	$ 1,066
  	8.5x6.5mm	1.61	$ 2,119
  	9x6mm	1.50	$ 1,974
  	9x7mm	1.97	$ 2,703	$ 1,862
  Pear	4x3mm	0.13	$ 44	$ 44	$ 32
  	5x3mm	0.19	$ 95	$ 67	$ 65
  	5x3.5mm	0.25	$ 119	$ 77	$ 76
  	5x4mm	0.32	$ 173	$ 139	$ 112
  	6x4mm	0.44	$ 277	$ 240	$ 168
  	6.5x4.5mm	0.52	$ 495	$ 343	$ 240
  	6.5x5mm	0.73		$ 491
  	7x5mm	0.70	$ 835	$ 627	$ 422
  	7.5x5mm	0.77	$ 906	$ 762	$ 555
  	8x5mm	0.80	$ 1,035	$ 717	$ 511
  	9x6mm	1.44	$ 1,619	$ 1,472
  Marquise	4x2mm	0.07	$ 20	$ 19	$ 15
  	4.25x2.25mm	0.09		$ 22	$ 17
  	4.5x2.5mm	0.13			$ 22
  	5x2.5mm	0.15		$ 42	$ 34
  	6x3mm	0.23	$ 126	$ 81	$ 64
  	6.5x3.5mm	0.35			$ 113
  	7x3.5mm	0.37	$ 227	$ 166	$ 135
  	7.5x3.5mm	0.42			$ 153
  	8x4mm	0.55	$ 343	$ 257	$ 216
  	9x4.5mm	0.71	$ 696	$ 583	$ 477
  	10x5mm	1.01	$ 1,312		$ 736
  Emerald	4x3mm	0.21	$ 86	$ 59	$ 45
  	5x3mm	0.27	$ 139	$ 106	$ 87
  	5x3.5mm	0.31	$ 176	$ 134	$ 100
  	5x4mm	0.42	$ 282	$ 234	$ 183
  	6x4mm	0.56	$ 510	$ 357	$ 325
  	6x4.5mm	0.80	$ 728
  	6x5mm	0.78	$ 760	$ 721	$ 572
  	6.5x4mm	0.60		$ 479
  	6.5x4.5mm	0.76	$ 798	$ 559	$ 557
  	6.5x5mm	0.74	$ 1,109		$ 549
  	7x5mm	0.95	$ 1,211	$ 981	$ 845
  	8x6mm	1.78	$ 2,453	$ 2,283	$ 1,645
  Square	1.75mm	0.03			$ 7
  	2mm	0.05			$ 12
  	2.25mm	0.06			$ 15
  	2.5mm	0.09			$ 22
  	2.75mm	0.12			$ 29
  	3mm	0.15			$ 40
  	3.5mm	0.20		$ 79	$ 80
  	4mm	0.40		$ 185	$ 139
  	4.5mm	0.49		$ 262	$ 206
  	4.75mm	0.59		$ 397
  	5mm	0.79	$ 664		$ 388
  	5.5mm	0.75	$ 945
  	6mm	1.09		$ 1,343
  Trillion	2.5mm	0.06			$ 13
  	2.75mm	0.08		$ 23	$ 18
  	3mm	0.10		$ 25	$ 23
  	3.25mm	0.14	$ 57	$ 36	$ 29
  	3.5mm	0.15	$ 61	$ 41	$ 36
  	3.75mm	0.17	$ 101	$ 76	$ 55
  	4mm	0.24	$ 135	$ 88	$ 68
  	4.25mm	0.25	$ 144	$ 97	$ 78
  	4.5mm	0.31	$ 191	$ 138	$ 125
  	4.75mm	0.31	$ 235	$ 171	$ 130
  	5mm	0.47	$ 279	$ 263	$ 204
  	5.25mm	0.45		$ 271
  	5.5mm	0.51	$ 499	$ 371	$ 279
  	5.75mm	0.59	$ 686	$ 565
  	6mm	0.72	$ 928	$ 676	$ 573
  	6.5mm	0.95	$ 1,119	$ 897	$ 772
  	7mm	1.10	$ 1,503	$ 1,124
  	7.5mm	1.39	$ 1,729	$ 1,421
  	8mm	1.79		$ 1,930
  Straight Baguette	3.75x2mm	0.10		$ 105	$ 97
  	4x2mm	0.15	$ 221	$ 126	$ 115
  	4.25x2.25mm	0.14		$ 147	$ 115
  	5x2mm	0.15			$ 170
  	5x2.5mm	0.22		$ 309	$ 250
  	6x3mm	0.39	$ 773	$ 591	$ 475
  	7x3.5mm	0.59	$ 1,437	$ 1,066	$ 808
  	8x4mm	0.88	$ 3,107	$ 2,477	$ 1,571
  Princess	1.5mm	0.02			$ 6
  	1.75mm	0.02			$ 6
  	2mm	0.05	$ 20	$ 16	$ 11
  	2.25mm	0.07	$ 28	$ 23	$ 17
  	2.5mm	0.08	$ 32	$ 26	$ 23
  	2.75mm	0.11	$ 59	$ 36	$ 31
  	3mm	0.15	$ 72	$ 55	$ 43
  	3.25mm	0.17	$ 95	$ 76	$ 55
  	3.5mm	0.21	$ 135	$ 97	$ 68
  	3.75mm	0.26	$ 175	$ 160	$ 112
  	4mm	0.35	$ 235	$ 192	$ 157
  	4.5mm	0.44	$ 364	$ 259	$ 186
  	5mm	0.61	$ 607	$ 520	$ 316
  	5.5mm	0.88	$ 1,220	$ 995	$ 986
  	6mm	1.04		$ 1,456	$ 1,343

Next Page

Last updated December 7, 2007
Copyright © 1995-2007 Gem Hut™. All rights reserved.