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

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

The method I used to determine the value is by first categorizing the stone based on the 4Cs + OT method.

The six criteria I have summarized in bullet form below:

HOW TO DETERMINE A VALUE OF BLUE SAPPHIRE? 

WHAT ARE 4C’s + OT

Once we know the above criteria we can then start comparing the four sapphires.  This is how I determine what the value of a blue sapphire 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

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

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