天然钻石协会&Tenoris：2024年美国天然钻石消费趋势报告（英文版）

Aithough every natural diamond is unique, the industry hasdeveloped systems that describe and group them accordingto key characteristics. These standardised scales provideprofessionals and consumers alike with an easy referencefor valuation, marketing and selection. The most widely usedcategorisation system is known as the 4Cs- carat weight,colour, clarity and cut. It was developed approximately 80years ago by Robert M. Shipley, founder of the GemologicalInstitute of America (GlA), to help hi