Scratch resistance is one of the most important quality factors for crystal glass rhinestones from China especially for applications such as jewelry, apparel, dance costumes, footwear and fashion accessories. Scratched or cloudy stones can affect the look of the final product and result in customer complaints.
But scratch resistance is not a one thing. The glass material, cutting process, polishing, coating, packaging and handling during transportation can affect the final quality. Buyers therefore need to consider scratch resistance early in the sourcing process.
1. Choose the Right Glass Type
The durability of the rhinestone is dependent on the quality of the glass. The various formulations of glass can have varying hardnesses and resistance to surface damage.
If you are purchasing crystal glass rhinestones from China, inquire as to what type and quality of glass the supplier is using. If it’s a new product you are making, ask for samples before you buy a bulk order.
The sample should be viewed in normal light and also in strong light. Inspect for scratches, cloudy spots, chips or other surface imperfections.
2. See the Cutting and Polishing
A well cut rhinestone will have clean facets and a smooth surface. If the cutting or polishing is not done well small imperfections may be left which make the stone more liable to scratch or chip during handling.
The consistency of the cutting and polishing process is especially important when dealing with products with more than one facet, like pointed back fancy stones and multi-faceted rhinestones.
Buyers can ask for production samples prior to mass production and compare the surface quality to the approved samples.
3. Plating and Coatings Research
Crystal glass rhinestones can have a special finish or coating on the back. These may be AB effects, metallic coatings or other decorative finishes;
The coating itself must adhere well. If the coating process is not controlled properly, the coating may peel off, become discolored, or be damaged during packaging and transportation.
For coated rhinestones, ask the supplier what the coating process is and if they have quality-control procedures for adhesion and appearance.
4. Pack it Right
Good quality rhinestones can be scratched if packed improperly.
Bulk rhinestones must not rub heavily against each other during transport. The correct packaging limits friction and movement. The inner packaging will depend on the product and may be composed of compartmentalized boxes, plastic bags, trays or other protective packaging.
The larger and more delicate the stones the more you may need to break up.
5. Request a Pre-Shipment Inspection
A sample quantity should be taken from the batch produced prior to the goods leaving China. Examine the stones for scratches, chips, surface defects, color consistency and coating quality.
It's also useful to check the new production run against an approved reference sample when repeat orders are placed. This is to help the supplier ensure that the quality is the same between batches.
If you are placing a large order or your rhinestones will be used in a high-end product, a third-party inspection can give you extra security.
6. See the rhinestones in their raw form.
Lab testing can be useful, but buyers should consider how the rhinestones will be processed by customers.
For example, rhinestones on a dance costume can be touched, transported and washed many times. Frequent contact with other parts can damage the stones in the jewelry.
A simple practical test can reveal potential problems before mass production starts. Rub, handle, pack and unpack samples under conditions similar to the final application. Inspect the surfaces under good light.
Summary
Asking a supplier whether the crystal glass rhinestones you import from China are “scratch-resistant” is not enough to ensure that they are scratch-resistant. Buyers should consider together the glass material, the quality of cutting and polishing, the coatings, the packaging and the inspection procedures.
The best way is to approve samples, clearly specify quality requirements and inspect bulk production before shipping. Working with a supplier that understands the quality requirements of fashion, jewelry and garment applications can also help reduce damage and ensure that repeat orders look the same.