- One brilliant-cut Fancy Vivid Yellow diamond, 3.01 carats - 18K gold - Ring size 6
GIA Report: Fancy Vivid Yellow colour, VS2 clarity 附美國GIA證書
GIA Report: Fancy Vivid Yellow colour, VS2 clarity
附美國GIA證書
Catalogue Essay
Coloured diamonds are graded in order of increasing colour strength, from Faint, Very Light, Light, Fancy Light and Fancy to Fancy Intense, Fancy Deep and Fancy Vivid. The colour description that GIA affords diamonds on grading reports is based on the hue, tone and on the saturation of that hue. For these coloured diamonds which can occur in a broad range of tone and saturation, a more vibrant colour typically means higher value. As Fancy Vivid is the highest grading for a coloured diamond, this Fancy Vivid Yellow possesses the top colour of yellow diamonds with the strongest saturation.
Coloured diamonds are usually cut to maximize the intensity of their colour rather than to maximize light return. The best cut is one that gives the most attractive face-up colour. As coloured diamonds are graded in the face-up position, the overall blend of factors, including areas of brightness, windowing and/or extinction is taken into consideration when determining what cut would suit the diamond best, whilst maintaining the colour saturation and an even colour distribution. A GIA diamond certificate will specify 'even' or 'uneven' according to the percentage of the colour distribution.
The round brilliant-cut is one of the rarest shapes for coloured diamonds, as they are usually fashioned to best maximize the weight of the often irregular-shaped rough. Whilst the round brilliant cut is the most popular cut among colourless diamonds as it maximises their brilliance. However, due to the high levels of wastage, it is rare to see a significant coloured diamond cut in this way. Therefore, it is very rare to find a fancy coloured diamond successfully cut into a round brilliant while still showcasing the highest strength of colour.