RANDOM ORIENTED MODIFIED BRILLIANT CUT ANVILS
Introduction:
Randomly Oriented Modified brilliant cut anvils are made from polished gem diamonds. They are a low cost alternative to the normal “modified brilliant cut” anvils because they are not (100)-oriented for the highest strength.
As their supply is abundant and their selection much easier and hence faster, we are able to sell these at prices 10 to 30% cheaper than the normal “Modified Brilliant Cut” anvils. This will also give you the opportunity to compare prices with those of some other diamond suppliers who do not specify the crystal orientation. For many applications an imperfect crystallographic orientation of the anvil may not be important and its effect on the pressure limit is not clear .
Please find below a chart with the average dimensions of brilliant cut gem diamonds.
Choose type:
Choose dimension of x:
|
MIN
WEIGHT
(CARAT) |
APPR
GIRDLE
DIAMETER |
APPR
HEIGHT |
|
| 0.10 |
| 0.15 |
| 0.20 |
| 0.25 |
| 0.30 |
| 0.35 |
|
| 3.10 |
| 3.50 |
| 3.80 |
| 4.10 |
| 4.40 |
| 4.60 |
|
| 1.86 |
| 2.10 |
| 2.30 |
| 2.46 |
| 2.64 |
| 2.75 |
|
 |
|
|
Choose design number of sides:
8 sided
16 sided
Choose design modifications:
NO BEVEL
SINGLE BEVEL
DOUBLE BEVEL
Choose selections (type Ia diamond):
- Low birefringence
All Randomly Oriented Modified Brilliant Cut diamond anvils are automatically selected according to the low birefringence criteria. Diamonds to be used for anvil manufacture are examined under a polarising microscope for birefringence. Diamonds with significant birefringence discontinuity, typical of inclusions, etc. are rejected. In addition diamonds can be selected for ultra low birefringence. Total birefringence is measured using crossed polarisers, a waveplate and matched to specifications. Normally:
1. Low birefringence <0.0001 => always included for "Randomly Oriented Modified Brilliant Cut anvils.
2. Ultra low birefringence <0.00005
- Low fluorescence
Almax Industries can select its diamonds for low fluorescence. Standard measurements include laser excitation at 532 nm and covers fluorescence background in the range of 542 to 608 nm (Raman shifts between 1000 and 3000 cm-1). Measurements for different wavelength ranges can be made available on request. In special cases customers can select their own diamonds for low fluorescence using their own measurement set-up. Almax classifies its diamonds with respect to fluorescence according to the following criteria:
1. UV low fluorescence
(click here for a typical spectrum):
Just checked by a UV lamp.
2. Raman low fluorescence
(click here for a typical spectrum):
The intensity of the background fluorescence of diamond at 1000 cm-1 relative
to the intensity of the single phonon Raman transition at 1332 cm-1 is less
than 0.5%.
The intensity of the two-phonon Raman transition at 2664 cm-1 is at least
1.25 times the intensity of the background fluorescence of diamond.
3. Raman ultra low fluorescence
(click here for a typical spectrum):
The intensity of the two-phonon Raman transition at 2664 cm-1 is at least 2
times the intensity of the background fluorescence of diamond.
