Performance Study of Pear-shaped Diamonds and Price Index Formula
This presentation provides a detailed analysis of the performance attributes of pear-shaped diamonds, including positive and negative aspects, rarity, vulnerability to chipping, and more. It also introduces a price index formula for evaluating diamond polish based on various factors such as rarity, opportunity, optical performance, and symmetry.
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Presentation Transcript
Cut Performance Study Pears
Attributes Positive Negative Rarity (R) Vulnerability to Chipping (D) Opportunity (O) Fluorescence index (F) Optical performance (P) Transparency index (T) Optical symmetry (S) Non-pleasing optical phenomena (Np) Face-up spread (Sp) including Face-up color grade difference (C) * Girdle Reflection under table, forming a continuous ring Shape appeal (Sa) * Kozibe * Culet (???)
Pear AJ-13.9_0.53 ct_H_VS1 Pear - BH1-31.23_0.51 ct_H_VVS1 Lab grade H color Face up color J color Lab grade H color Face up color J color
Pear BQ6-165.1_0.52 ct_H_IF Pear BR12-37.3_0.52 ct_I_IF Lab grade H color Face up color J color Lab grade I color Face up color J color
Price Index Formula Price of a polish Price of a polish / Rarity (R) Opportunity (O) Price of same color - clarity weight ideal RBC Optical Performance (P) Optical Symmetry (S) =(1+R)^a * (1+O)^b * (1+P)^c * ((5+S)/5)^d * (1+Sp/100)^e * ((23+C)/23)^f * (1+Sa)^g * (1+D)^-h * (1+F)^-j * (1+T)^-k * (1+Np)^-m Face-up spread (Sp %) Face-up color grade difference (C) Shape appeal index (Sa) 1/ Vulnerability index (D) Where, a, b, c, d, e, f, g, h, j, k and m are power index 1/ Fluorescence index (F) 1/ Transparency index (T) 1/ Non-pleasing index (Np)
