|
| |
|
|
 |
| CUTTING
CHARACTERISTICS |
 |
| |
|
|
| |
Table Star/ Upper main facet |
| |
 |
Upper
girdle facet |
| |
| Girdle |
| |
| Lower
girdle facet |
| Lower
main facet |
| |
Culet |
|
|
When a stone is cut according |
|
|
| to
good proportions, the light is |
If the stone is cut too thick, |
If the stone is cut too much flat,
the |
| reflected from one facet to
another |
part of the light escapes |
light escapes from it before to
be |
| and arises by the top. |
outside downwards. |
returned on another facet. |
 |
 |
 |
|
USUAL PROPORTIONS . |
 |
|
|
| FL |
NFL |
SI1 |
SI2 |
MI1 |
 |
 |
 |
 |
 |
| Flaw
less |
Near
flaw less |
Slightly
included 1 |
Slightly
included 2 |
Medium
included 1 |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| MI2 |
MI3 |
VI1 |
VI2 |
HI |
 |
 |
 |
 |
 |
| Medium
included 2 |
Medium
included 3 |
Very
included 1 |
Very
included 2 |
Highly
included |
|
|
|
|
|
|
Note that our camera can grasp very small inclusions
almost invisible to the |
|
naked eye; this is
why you can usually see these inclusions on the screen. |
|
|
| PRINCIPAL
COLORING ELEMENTS IN THE GEMS. |
|
|
| Chromium |
Ruby,
Emerald, Pyrope garnet, grossularite and uvarovite, Tourmaline. |
| Copper |
Dioptase,
Malachite, Azurite. |
| Iron
|
Sapphire,
Aquamarine, Citrine, Almandin garnet. |
| Manganese |
Morganite,
Pink tourmaline, Spessartite garnet. |
|
Nickel |
Chrysoprase. |
| Titanium |
Blue
Sapphire. |
|
Vanadium |
Green
beryl, Blue zoïsite , Garnet. |
| |
|
| |
Sawing
a big star ruby in our workshop. |
 |
|
 |
|
|
| Hand
cutting. |
Mechanical
cutting. |
|
|
|
|
|
 ™ |
|
All of the pictures on this
website
have been shot by
gggems.com |
| Text written by Alain
Darbellay. |
|
