Gemstone working: the art of going from rough to brilliant

Gemstone working is a time-honored art that transforms beautiful raw stones given by nature into stunning pieces of jewelry. Each step in the process requires precision and technical support, and each gemstone is created with a mastery of the craftsmanship of the tools and techniques used in the process, which have evolved and been perfected over time.

Cutting is the first step in gemstone processing, and its purpose is to remove unwanted parts and give the stone its basic shape. Commonly used cutting tools include: saw blades, diamond cutters and laser cutters.

Saw blades: are used to cut the raw stone into the right size and shape. Modern saw blades usually use diamond as the cutting edge.
Diamond cutters: are used when cutting harder stones, such as diamonds. These cutters have a very sharp edge and are able to cut gemstones precisely without causing damage.
Laser cutters: For some particularly hard or fragile gemstones, laser cutting offers a non-contact cutting method that reduces the risk of cracking and chipping.

Setting tools

Setting is the final and crucial step in gemstone processing. It determines the beauty and stability of the final product of the gemstone. Commonly used setting tools include:

Setting mount: a special jig used to hold a gemstone in place and to facilitate fine setting work.

Pliers and tweezers: used to accurately adjust the position of the stone to ensure that it is securely mounted on the metal mount.

Hammer and chisel: used to create the metal bracket and ensure that the stone fits snugly.

Other auxiliary tools

In addition to the main tools mentioned above, there are a number of auxiliary tools that are also essential for gemstone processing:

Microscope: to provide a magnified view when performing delicate work and to ensure accuracy.

Measuring tools: such as calipers and gauges, used to accurately measure the dimensions of the gemstone.

Drilling tools: used to drill holes in gemstones for threading or fixing.

So out of the many cutting tools available, why are diamond blades the number one choice?
Diamond blades are the tool of choice because of their extreme hardness and wear resistance. The edges of diamond blades are covered with tiny diamond particles that are pressed onto the edges of the blade or grinding wheel through a high temperature, high pressure process, allowing the diamond blade to effectively cut through gemstones while maintaining the integrity and shape of the stone. In terms of diamond processing, since diamonds are the hardest substance in nature, their cutting is usually accomplished using a blade or grinding wheel with diamond particles. The cutting process includes steps such as planning, cutting, grinding and polishing to ensure the diamond’s brilliant light.
When choosing a diamond blade, consider its hardness, wear resistance, heat transfer coefficient, as well as the sharpness and stability of the cutting edge. In addition, appropriate cutting parameters and processes need to be considered to fully utilize their advantages

In gemstone processing, in addition to diamond blades, a variety of tools and equipment are used, such as grinding wheels, abrasive fluids, threaded zinc wires and huller stones. Grinding wheels are used to grind the surface of the stone, abrasive fluids are used for cooling and lubrication, threaded zinc wires are used to hold larger stones in place, and hullers are used to hone and polish the stone. These tools and equipment work together to ensure quality and efficiency in gemstone processing.

The diamond working process includes the steps of planning, cutting, grinding and polishing. During the planning stage, the artisan carefully observes and measures the rough stone to determine the best cut. In the cutting stage, diamond particles on a diamond blade or grinding wheel are utilized to follow a predetermined cutting line. In the polishing stage, the cut diamond is trimmed to enhance its beauty. In the final polishing stage, fine polishing powders are used to achieve a mirror-like finish on the surface of the diamond, allowing the diamond to shine with a unique radiance.

Diamond tools play an important role in the field of ultra-precision machining, as they are capable of achieving extremely high workpiece precision and very low surface roughness. Natural diamond tools (ND) and man-made diamond tools (MCD and CVD) are widely used in optical component processing and other high-precision requirements due to their high hardness, high wear resistance and high thermal conductivity.

In gemstone processing, the use of diamond blades is crucial; they not only determine the final shape of the stone, but also affect the luster and fire of the stone. High-quality diamond blades provide better machining results and enable gemstones to exhibit the best optical properties.