The
process of cutting and polishing gems is called lapidary. All gems are cut and
polished by progressive abrasion using finer and finer grit.
Diamond, the hardest naturally occurring substance, is used to cut
and polish the hardest stones.
The
rough material is cubed, slightly larger than the required finished bead size,
before being inserting into the Bead Mill.
Bead
mills are used to grind and sand large quantities of beads simultaneously. They
typically employ a grooved lap and a flat lap between which
the beads are rolled and worn to shape.
Silicon Carbide grits are used to shape
the rough into round shapes. Different types of material require different
grits, milling times, etc.
After
shaping and sanding, beads are usually drilled and then polished by tumbling. Tumbling
is turning large quantities of beads at a slow speed in a rotating barrel with
abrasives and water for extended periods (days or weeks).
By tumbling with
progressively finer grades of abrasive (usually silicon carbide) and washing
carefully between grades, the beads are gradually smoothed and polished.
Tumbling barrels are often hexagonal in outline in order to enhance the
stirring action of barrel rotation. An alternative to rotary tumblers is a
vibratory machine, often called a vibratory tumbler, in which the containing
barrel vibrates rather than rotates.
The more stationary arrangement of
vibratory machines makes it much easier to examine the progress of the stones
inside, whereas standard tumblers must be halted in order to check progress.
Today,
most semi precious gemstone beads are cut in standard round sizes – ie 4mm,
6mm. 8mm, 10mm etc. Often there is a
.5mm +/- tolerance in the finished size.
They are usually sold as 15” or 16” loose strung strands.
Semi precious beads are a natural material and therefore some natural
inclusions, variations in colour and patterning are normal. This is what makes them so exciting and why
jewellery designers love to work with them.
Wow, very impressive and informative details for the gemstones beads made. Thank you very much. Pancharatna gems Coimbatore | Kalpana Srikaanth
ReplyDeleteI am sure "After shaping and sanding, beads are usually drilled and then polished by tumbling. Tumbling is turning large quantities of beads at a slow speed in a rotating barrel with abrasives and water for extended periods (days or weeks). " paragraph has touched all the internet people, its really really nice paragraph on building up new blog. Very informative and interesting post.It is really a big help. Thank you so much for sharing it with us. natural gemstone beads wholesale
ReplyDelete