| Component | Description | ||
| Base Metal | The foundation of the jewelry piece, providing structure and strength. Common choices: brass (most popular), copper, stainless steel, zinc alloy, or sometimes sterling silver. | ||
| Gold Layer | A thin coating of 18K gold (75% pure gold + 25% alloy metals like copper, silver, or palladium for durability and color consistency). | ||
| Plating Thickness | Typically ranges from 0.01 to 2.5 microns (standard plating is usually 0.175-0.5 microns). Higher-quality plating may be 5-6 microns thick. |
| Type | Definition | Gold Content | Durability | Price Range |
| 18K Gold Plated | Thin gold layer on base metal | Very low (microscopic) | Lowest | Most affordable |
| Gold Vermeil | Thick gold layer (≥2.5 microns) on sterling silver base | Higher than plated | Moderate | Mid-range |
Gold Filled | Thick gold layer (≥5% of total weight) bonded to base metal | Significant High | High | Mid-to-high |
| Solid 18K Gold | Entire piece made of 18K gold alloy | 75% pure gold | Highest | Most expensive |
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