Price of a yellow sapphire depends upon the 4 factors CUT COLOR CLARITY CARAT (4C’s) weight origin and treatment.
Cut- The cutting of the stone/gemstone not only improves the virtue of the gemstone but also cover the inclusions. Also, a better faceted yellow sapphire is valued more over a normal or odd shape Pukhraj.
Color- Color is one of the most significant factors in any gemstone or yellow sapphire. It directly links to the cost of yellow sapphire. A bright yellow or lemon color yellow sapphire to an extremely dark yellow or golden yellow will link to the value of it.
Clarity- In simple words the clearer the stone the higher the value. Inclusions in any gemstone can be viewed with a bare eye or with an eyeglass. as far as the stone is natural, inclusions will be there.
Carat Weight- The higher the weight, the rare the pc it becomes. Price per carat increases with its size.
Origin/ Source- Origin of a yellow sapphire or any other gemstone is a very important factor to decide its price.
Srilankan( Ceylonese) origin is considered best in yellow sapphire (pukhraj). Ceylon pukhraj can cost between 1000 to 100000 per carat ($14 to $1427), depending upon all other factors. Thailand or Bangkok yellow sapphires are generally heated and treated, resulting in a more economical price but no Astrological or Jyotish value.
Treatment- Hight temperature treatments are used to improve color or to improve the accuracy of yellow sapphire. Glass lead is also used to fill the pits and cracks for better transparency.
It is always recommended to Buy a certified yellow sapphire (Pukhraj) online or from the shopkeeper, along with a certificate which clearly indicates the stone is 100% authentic.