Natural stone is a stunning and vibrant material that can greatly enhance the aesthetics of any home. However, many homeowners are not familiar with the quality standards of natural stone, which often leads to poor choices when selecting tiles or stones. Understanding these standards is essential for making informed decisions.
The quality of natural stone is typically evaluated in three main areas: appearance, processing, and gloss. Each of these aspects plays a crucial role in determining the overall value and performance of the stone.
**First, inspect the appearance from three distances**
When evaluating the appearance quality of natural stone, it's important to look closely at surface defects such as chipped edges, cracks, stains, color variations, pits, warping, and uneven surfaces. According to industry standards, high-quality stone should have consistent color and pattern, with no visible defects in superior-grade products.
To check for defects, place the stone flat on the ground and observe it from 1.5 meters away. If any flaws are visible, the stone is considered defective. If the defects are only noticeable at 1 meter, they are considered minor. If nothing is visible from 1 meter, the stone is considered defect-free.
**Second, measure processing quality using three key ratios**
The processing quality of stone directly affects its visual appeal and durability. Key indicators include dimensional accuracy (length, width, thickness), flatness, and angle tolerance. Based on these measurements, stones are categorized into superior, first-class, and qualified grades.
Experts recommend that consumers clearly specify the desired quality level in their purchase contracts to avoid vague terms like "meeting national standards." For example, if a batch is labeled as "superior," no more than 5% of the pieces should be first-class. Similarly, for first-class products, no more than 10% can be qualified, and for qualified products, no more than 10% can be non-conforming.
**Third, assess the gloss level with three units**
Gloss, also known as specular gloss, refers to how well the stone reflects light. For natural granite, the front surface should have a high gloss level that clearly reflects the surroundings. The minimum required gloss value is generally 75 units, with most premium granite ranging between 80 and 90 units.
For marble, the standard sets different minimum gloss levels based on chemical composition. Superior-grade marble should have a minimum of 90, 80, or 60 units, depending on the type. Consumers are advised to specify the desired gloss level in their contracts or use a reference board as a benchmark.
With the increasing popularity of natural stone in home improvement, the market has seen significant growth. It’s estimated that around 20% of home improvement projects involve natural stone, with some high-end homes using it in up to 30-40% of their finishes. From floors to countertops, and cabinets to walls, stone has become a staple in modern interior design.
As more companies enter the market, they are focusing on branding, customer service, and experiential marketing to stand out. This trend suggests that the home improvement sector will continue to drive innovation and growth in the stone industry for years to come.
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