4C分级对小克拉彩色黄钻价格的影响分析

Analysis of Effect of 4C Grading on the Price of Small-Carat-Weight Fancy Yellow Diamond

近十年来,彩色钻石市场日益火热,其价格亦逐渐增长,但限于数量稀少等原因,彩色钻石市场未能像无色钻石一样建立起成熟的报价表制度。目前国内外对其价格方面的研究并不多,因此对彩色钻石价格影响因素的研究显得尤为重要。本文基于某中大型钻石批发公司提供的切工为垫型的1 031颗彩色黄钻的全球报价数据,重点对0.20~0.91ct的小克拉彩色黄钻价格的影响因素进行了分析。结果显示,4C分级(克拉、净度、切工、颜色)和彩色黄钻的价格存在不同程度的线性关系,重量(克拉)通常和价格呈正相关关系;颜色对彩色黄钻报价影响较大,切工对彩色黄钻报价影响较小。最后,量化小克拉彩色黄钻4C等级差对其报价影响发现,净度、颜色、切工存在不同大小的等级差溢价;不同净度、颜色、切工对彩色黄钻的价格增长倍率等亦存在不同程度的影响。

Over the past decade years, the coloured diamond market has became more and more fiery, and the price has been gradually increasing. However, it is not very clear of vari-ation law of the market price since its rarity and other factors. So far, the coloured diamond price system has not been established as mature as colourless diamond, and few researches reported the price of coloured diamonds at home and abroad. Therefore 〉 studying the influ-ential factors of coloured diamond price is very important. The authors analyzed the price of the total 1 031 fancy yellow diamonds of cushion cutting in global markets？ especially the price of diamonds with weight varying from 0. 20 -0. 91 ct, which was provided by a mid- large diamond wholesale company. It is found that there is a linear relationship between 4C （including carat, clarity, cut, colour） and price of fancy yellow diamond respectively. The carat weight has positive linearity with carat price？ and colour also influences a lot on i t, while cutting impacts a little to its price. Additionally, ratio of cutting grade difference of fancy yellow diamond with small carat weight and its price has been quantified. Through horizontal comparison, premium was dependent on clarity, colour and cut grade difference as well as the price and the price growth rate of fancy yellow diamond.