What to remember
Cost and carat
The final price of your sapphire will be determined by many factors, including colour, carat, cut, clarity, treatment and origin. A right combination of these will ensure your gem’s long-term value remains steady, perhaps even increasing in time.
Large sapphires are extremely rare and in limited supply. For this reason, carat weight will make the price of your gem increase exponentially. The price of a 10-carat sapphire is usually 20 times that of a one-carat stone.
Colour is the most significant factor affecting the value of a sapphire. However, unlike diamonds, there is no internationally accepted colour grading system for this gemstone. 77 Diamonds have adopted the ICL’s seven levels of colour intensity, which range from Dark to Very Light.
The most sought-after colour intensity in sapphires is Vivid. This colour may also be described as ‘Royal Blue’, due to its deep, saturated tones.
Some blue sapphires can have slightly violet or green overtones. If these secondary colours are intense and clearly visible, this may decrease the value of your sapphire.
Inclusions in sapphires are common, well accepted and often serve to indicate the origin of the stone. There are three levels of clarity:
Cut and shape
- “Eye Clean” (EC1 – EC2) indicates that inclusions are invisible to the unaided eye. Eye clean sapphires will be more valuable due to their scarcity.
- “Visible inclusions” (VI1 – VI2) indicates that inclusions are only slightly visible to the unaided eye.
- “Included” (I1 – I2) indicates that inclusions are obvious to the unaided eye.
Usually, sapphires are both brilliant and step cut
. A brilliant cut ensures an even display of light reflections throughout the gem, while a step cut lends intense fire to the piece. Some sapphires may also be cabochon cut, giving them a smooth and rounded finish. Keep in mind, the quality of the cut will determine the overall price of your gemstone.
On the other hand, the shape of your sapphire will not have a direct impact on price, as this is largely a matter of personal preference. The most common shapes for sapphires are round and oval
, but you may also find pear or heart
shaped stones. Treatment
Sapphires are most commonly enhanced through heat treatment
. By applying heat to the gem, experts have found that both colour and clarity are greatly intensified. This is a widely accepted practice in the jewellery trade and most methods have no harmful effect on the stone’s longevity.
Only the finest and rarest sapphires are unearthed in a perfect state without any need for further treatment, making them significantly more valuable. On average, an unheated sapphire can be 2.5 times more expensive
than a virtually identical heated sapphire. Origin
Although some sapphires may look similar, their prices will differ due to origin. The most expensive sapphires come from Kashmir
, a region historically known for producing stones of exquisite colour and quality. The second finest origin is considered to be Myanmar
, followed closely by Sri Lanka, Madagascar or Tanzania
. Finally, sapphires from basaltic countries (namely Australia, Ethiopia, Nigeria, Vietnam, Thailand and Cambodia) are least valuable in terms of origin.