Find HS Code and trade information for 平底裸钻

平底裸钻

平底裸钻 (Píngdǐ luōzhuān) refers to a loose diamond that has been cut with a pavilion that is flattened or has a very small culet. "裸钻" (luōzhuān) translates to "loose diamond," meaning it is not set in jewelry and is sold individually. The "平底" (píngdǐ) aspect describes a specific cut characteristic.

Material:

• Diamond: Composed of carbon atoms arranged in a specific crystal structure. Diamonds are renowned for their exceptional hardness, brilliance, and high refractive index. The quality of a diamond is assessed using the "4Cs": Carat, Cut, Clarity, and Color.

Purpose:

• Jewelry Setting: Primarily sold for use in engagement rings, wedding bands, necklaces, earrings, bracelets, and other fine jewelry.
• Investment: High-quality diamonds can be held as a store of value.
• Scientific/Industrial Applications: While less common for this specific cut, diamonds are used in cutting tools, abrasives, and other industrial applications due to their hardness.

Function:

• Light Performance: The cut of a diamond determines how it interacts with light. A well-cut diamond maximizes brilliance (white light reflection), fire (dispersion of light into spectral colors), and scintillation (sparkle). The flat pavilion influences light return, and can sometimes affect the overall brilliance if not executed precisely.
• Aesthetic Appeal: Diamonds are prized for their beauty and symbolic significance.

Usage Scenarios:

• Custom Jewelry Design: Individuals purchasing loose diamonds often have them custom-set into unique jewelry pieces.
• Replacement Stones: Used to replace lost or damaged diamonds in existing jewelry.
• Upgrading Stones: Consumers may purchase larger or higher-quality diamonds to upgrade their existing jewelry.
• Diamond Grading and Certification: Loose diamonds are typically graded and certified by independent gemological laboratories (e.g., GIA, AGS) to assess their quality.

Common Types/Variations (related to the cut):

• Round Brilliant: The most popular diamond shape, known for its exceptional brilliance. While a round brilliant can have a flat pavilion, it's not typical.
• Fancy Shapes: Emerald, Princess, Oval, Marquise, Pear, Cushion, Asscher, Radiant, and Heart shapes. Flat pavilions are more commonly seen in some of these shapes, particularly those with larger table facets.
• Culet Size: The culet is the small facet at the bottom of the diamond. A flat pavilion often corresponds to a very small or non-existent culet.
• Cut Grades: Diamonds are graded on their cut quality (Excellent, Very Good, Good, Fair, Poor). A flat pavilion can affect the cut grade, particularly if it negatively impacts light performance. A well-executed flat pavilion won't necessarily lower the grade.
• Table Percentage: The size of the table facet (the large flat surface on top of the diamond) can also influence light performance and is related to pavilion size.

平底裸钻，指的是未镶嵌、未加工或简单切割的钻石。根据提供的资料，以下是相关的HS编码：

• 7102100000: 钻石，不论是否加工，但未镶嵌或未设置：未分类的。

  • 71: 宝石及贵金属制品。
  • 02: 钻石。
  • 10: 未加工或简单切割的钻石。
  • 0000: 具体细分，表示未分类的钻石。
  • 关税构成：基础关税0.0%，加征关税7.5%，2025.4.2后加征关税30.0%，总税率37.5%。

• 7102310000: 钻石，不论是否加工，但未镶嵌或未设置：非工业用：未加工或简单锯切、劈开或粗加工的。

  • 71: 宝石及贵金属制品。
  • 02: 钻石。
  • 31: 非工业用。
  • 0000: 具体细分，表示未加工或简单锯切、劈开或粗加工的钻石。
  • 关税构成：基础关税0.0%，加征关税7.5%，2025.4.2后加征关税30.0%，总税率37.5%。

请注意，以上编码均适用于未镶嵌或未设置的钻石。在申报时，请根据钻石的具体加工程度选择合适的编码。