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The basis of the crystal grade certification is the result of visual inspection without the help of a magnifying glass. There are the following levels: AA grade: The entire crystal is transparent and flawless, and there is no visible artifact. Grade A1: Very fine blemishes, or small natural inclusions, or clouds or batt not exceeding 3 mm. Grade A: There are subtle blemishes, clouds or blobs that are easily visible to the naked eye. â€â€---Crystal Information
â€â€AB grade: There are large clouds of inclusions, small ice cracks, and small scratches on the outside. Class B: More than half of the entire crystal is cloud and inclusions, large ice cracks, and small cracks on the outside. Grade C: At the lowest level, the overall appearance is cloud-like, the ice cracking marks are obvious, and there are obvious cracks on the appearance, as if broken at any time. â€â€
For more information, please visit China Crystal Industry Network, China Crystal Industry Network official website http://sjcyw.99114.com
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