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 …

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