Mohs Hardness Test Kit 5–9 – Diamond, Gemstone & Mineral Scratch Tester

This Mohs Hardness Test Kit 5–9 is a practical scratch testing kit used to help identify the hardness of minerals, rocks, gemstones, diamonds, and jewelry materials.

It includes 5 hardness testing pens supplied in a plastic storage case with a magnetic lid, making it easy to store, carry, and use.

The hardness pens cover Mohs levels 5 to 9, which includes many of the rocks and gemstones commonly used in jewelry making. This makes the kit useful for jewelers, gemologists, collectors, lapidary workers, students, mineral dealers, and gemstone buyers.

To use the kit, lightly try to scratch the stone with one hardness pen. If it does not scratch the stone, move to the next higher pen until a scratch appears. The hardness of the stone is usually estimated as the number below the pen that scratched it.

For example, if the Mohs 7 pen does not scratch the stone but the Mohs 8 pen does, the stone is approximately between Mohs 7 and Mohs 8 in hardness.

For diamond-like stones, a genuine diamond has a hardness of Mohs 10, so it should resist scratching from the Mohs 9 pen. However, Mohs testing is only one identification method and should be used together with other gemological tools for final confirmation.

Key Features

• Mohs hardness test kit 5–9
  
• Includes 5 hardness pens
  
• Supplied in a plastic case with magnetic lid
  
• Helps identify minerals, rocks, gemstones, diamonds, and jewelry materials
  
• Useful for gemstone scratch testing and hardness comparison
  
• Covers hardness levels used by many jewelry stones
  
• Compact and portable for shop, lab, classroom, workshop, or field use
  
• Ideal for jewelers, gemologists, collectors, students, and mineral dealers

How to Use

• Choose a hardness pen.
  
• Lightly test on a hidden or less visible area of the stone.
  If the pen does not scratch the stone, try the next higher hardness pen.
  When a pen scratches the stone, the stone’s hardness is approximately below that
  number.
  
• Use the result together with other gemological tests for better identification.

Mohs Hardness Scale

• 1-Talc    Very soft
  
• 2-Gypsum    Soft, can be scratched easily
  
• 3-Calcite    Can be scratched by copper
  
• 4-Fluorite    Medium-soft mineral
  
• 5-Apatite    Common jewelry and mineral testing range begins
  
• 6-Orthoclase    Harder than many softer stones
  
• 7-Quartz    Hard mineral, can scratch glass
  
• 8-Topaz    Very hard gemstone level
  
• 9-Corundum    Ruby and sapphire hardness level
  
• 10-Diamond    Hardest natural material on the Mohs scale

Important Note
This is a scratch test, so use carefully and test only on a hidden or less visible area. Mohs hardness testing is helpful for gemstone and mineral identification, but it should not be used as the only method for diamond or gemstone authentication.

Why Are the Testing Tips White?
The tips may appear white or colorless because they are made to represent a specific hardness level, not the natural color of the reference mineral. Minerals such as apatite, quartz, topaz, and corundum can occur in many colors, including white or colorless. For Mohs testing, the important factor is scratch resistance, not color.