MODIFIED BRILLIANT CUT ANVILS

Introduction:

Modified brilliant cut anvils are made from polished gem diamonds. Please find below a chart with the average dimensions of brilliant cut gem diamonds.

Anvils_Gen_Info

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
Anvils_Gen_Info

Choose design modifications:

NO BEVEL
SINGLE BEVEL
DOUBLE BEVEL
Anvils_Gen_Info

Choose selections (type Ia diamond):


- Low birefringence

All 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 ultralow birefringence. Total birefringence is measured using crossed polarisers, a waveplate and matched to specifications. Normally:

1. Low birefringence <0.0001
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.