Thursday, 12 January 2017

Simple Steps to Select Round Brilliant Diamonds

Step 1
From www.niceice.com: http://niceice.com/diamond-buying-secrets/15-seconds-diamond-buying-success/
Total depth between 59 – 61.8%
Table diameter between 53 – 58%
Crown angle between 34.3 – 34.9 degrees*
Pavilion angle between 40.6 – 40.9 degrees
Lower girdle facets between 75 – 78%**
Star facets between 45 – 50%*** (talked to him recently, he said 55% is okay)
Girdle thickness between thin and slightly thick
Culet: AGS pointed or GIA none

Crown angle and Pavilion angle are very important in determining the performance.

Step 2
For GIA cert, you can always use the cut score calculator as a starting point. Just key in the cert number:
https://enchanteddiamonds.com/cut-score-calculator

Step 3
Count your HCA score based on details on cert. It is a REJECTION tool, not a SELECTION tool. You can reject any stones that go beyond the score or 2:
https://www.pricescope.com/tools/hca

Step 4
Count your ANA/NAJA Cut Class based on details on cert:
http://datlas.com/AGA_NAJA_Cut_Class_grader/index.php

Step 5
Once done filtering, proceed to request for:
- Diamond image, ASET image, IdealScope image, Hearts & Arrows image.
If the vendor can't provide, you are buying blind and there is a risk. Relying on proportions alone are not enough.

Other vendor suggestions
Non-mainstream stores (just Facebook them):
1. Tailored Jewel - Customer friendly, budget friendly (for their promotion)
2. ZCOVA - Budget friendly (for their promotion)... however, never engage face-to-face before. Just asking out of curiousity.
3. iDo Jewellery - Customer friendly, budget okay-okay, good workmanship.
4. Eumayco - Budget friendly (for their promotion)... however, never engage face-to-face before. Just asking out of curiousity.

Local shops recommendation based on feedback
1. Wah Chan (GIA diamonds)
2. HABIB (GIA diamonds)

US online stores
1. WhiteFlash
2. Brian Gavin Diamonds
3. Prefer GIA? Try JamesAllen, but they only ship up to Singapore.

Some diamonds may seem cheap for the 4Cs, but for any diamonds, it is important to repeat Step 1 - Step 5. You can skip Step 2 for non-GIA graded diamonds.