How to Determine a Value of Blue Sapphire? Based on 4Cs plus OT – A Buying Guide [Video]

In this post, I decided to do a video tutorial explaining how I will go about determining the value of a blue sapphire.

The method I use to determine the value of a particular sapphire (or any gemstone) is by first categorizing the stone based on 4Cs + OT method, which are the six criteria I have summarized in bullet form below:

4C’s + OT

Once we know the above criteria we can then start comparing and declaring what a blue sapphires value should be.

Summary of the four blue sapphires which I compared in the video (from right to left) is provided below:

1.96 carats Dark Sapphire

Total Price – US$1,500

  • Color –
    • Hue: Royal Blue Range with some color zoning (not uniform color)
    • Tone: Dark
    • Saturation: Medium
  • Carat weight – 1.96 carats
  • Clarity – eye-clean with no visible inclusions
  • Cut –
    • Oval Shape
    • Good to Very Good as the stone is in flatter range
  • Treatment level – Normal Heat Treatment
  • Origin – Assuming Thailand (very rare now days)

2.08 carats Blue Sapphire

Total Price – US$1,248

  • Color –
    • Hue: Cornflower Blue
    • Tone: Medium
    • Saturation: High
  • Carat weight – 2.08 carats
  • Clarity – eye-clean with no visible inclusions
  • Cut
    • Oval Shape
    • Good to Very Good as the stone is in flatter range
  • Treatment level – Normal Heat Treatment
  • Origin – Madagascar
  • Product link: https://www.thainativegems.com/product/certified-2-08-carats-heated-blue-sapphire/

7.93 carats Blue Sapphire

Total Price – US$5,550

  • Color –
    • Hue: Blue with major color zoning areas – some areas in the sapphire are clear white while others have lighter hue
    • Tone: Medium
    • Saturation: Low to Medium
  • Carat weight – 7.93 carats
  • Clarity – eye-clean with no visible inclusions
  • Cut –
    • Oval Shape
    • Very Good to Excellent as stone is quite uniform in dimensions
  • Treatment level – Normal Heat Treatment
  • Origin – Sri Lanka
  • Product link: https://www.thainativegems.com/product/7-93-carats-natural-blue-sapphire-sri-lanka/

10.03 carats Violet-Blue Sapphire

Total Price – US$18,054

  • Color –
    • Hue: Violet-Blue, uniform color
    • Tone: Medium
    • Saturation: Medium to High
  • Carat weight – 10.03 carats
  • Clarity – eye-clean with no visible inclusions
  • Cut –
    • Oval Shape
    • Very Good to Excellent as stone is quite uniform in dimensions
  • Treatment level – No indications of Heat Treatment (no treatment)
  • Origin – Sri Lanka
  • Certified by GRS
  • Product link: https://www.thainativegems.com/product/grs-certified-10-03-carat-unheated-untreated-violetish-blue-sapphire-sri-lanka/

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