polishing, they are called intan mendjadi. The uncut Diamonds are called podi ; the cut stones intan.
According to Posewitz the following varieties are distinguished :—
Intan Katja kitam, of bottle-green colour, and of great
value. Buntat intan, hard, dark and not to be cut : when spherical,
they are called the " Soul of the Diamond," and are
worn as amulets. Intan-ajer-Laut, or Sea Water Diamonds, of pale blue
colour. Radja intan, or King of Diamonds ; of red colour, very
rare. Intan minjak, brown Diamonds. Chaping, triangular flat twin crystals.
The
largest Borneo Diamond discovered of late years was found in 1865 at
the diggings of M. Beretti at Tjempaka. It weighed in the rough 25
carats, and when cut 18-1/2 carats.
A Diamond of 77 carats
was found near Gunong Lawak, in South Borneo, and passed into the
possession of the Sultan of Martapura. It is said that a Diamond
weighing 70 carats, known as " Segima," is the property of the Sultan
of Matan.
The
art of cutting and polishing Diamonds has long been parctised by the
natives of Borneo, and is rather extensively carried on at Pontianak
and Martapura. In the case of octahedral crystals, they simply rub down
the solid angles at the top and bottom, and having polished these
culets regarded the work as complete, never allowing the stone to lose
weight by cutting facets on the sides
