Pear Cut Performance Study: Attributes, Grades, and Price Index Formula

This content delves into a comprehensive study of pear cut diamonds, focusing on attributes like Positive/Negative Rarity, Vulnerability to Chipping, Fluorescence Index, and more. It includes analysis of specific pear diamonds such as AJ-13.9_0.53.ct_H_VS1 and BQ6-165.1_0.52.ct_H_IF, along with insights on optical performance, symmetry, and shape appeal. Additionally, the Price Index Formula for determining the value of polished diamonds based on various factors is explored.

• Pear Diamonds
• Cut Performance
• Price Index Formula
• Optical Symmetry
• Fluorescence Index

anayah Follow

Uploaded on Aug 01, 2024 | 0 Views

Download Presentation

Please find below an Image/Link to download the presentation.

The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.

Presentation Transcript

1. Cut Performance Study Pears

2. 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 (???)

3. 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

4. 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

8. 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)