Gemstones Of Sri Lanka.
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The traditional method of gemstone faceting done by a manual instrument called ‘Hanaporuwa’ also known as the “Pattale” by natives . Hanaporuwa (Ceylon Bow Cutter) was the main instrument of gemstone faceting in Sri Lanka until the early 1970’s.
These cutters use a bow to power a vertical lap, often holding the stone by hand or with a handheld dop as they cut and polish. They have a high degree of skill in orienting rough gemstones to achieve the best face-up color while retaining weight.
The cutting of asteriated gemstones is amongst the most challenging tasks a gemstone cutter faces. It is affected by several factors which must be taken into consideration during the cutting & polishing process.
A gemstones that displays asterism is always cut en cabochon in order to display the “star effect” However, the star will only appear when the cabochon dome is cut in a certain direction depending on the type of gemstone. For corundum (ruby and sapphire) the cabochon has to be cut with the dome along the c-axis (optic axis) of the stone for it to display asterism. The star effect is displayed due to inclusions (like tubes, silk, etc.) which are parallel to each other.
Demuwawatha 05
Gem cutting in Sri Lanka is a mixture of traditional techniques, utilizing some of the world’s most experience in orientation of rough and modern precision cutting.
Decades and even centuries of knowledge have been passed down on orienting sapphires and other gemstones such as cat’s-eye chrysoberyl.
Негізгі бет කෝටි ගනන් වල මැණික් අපේ ක්රමේට කපන පොයින්ට් මාමා - Traditional Way To Cutting Gemstones
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