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
- Color
- Carat Weight
- Clarity
- Cut
- Origin
- Treatment levels
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
- 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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