Sapphire, with its hardness of 9 on Mohs hardness, is second only to diamond, which renders it one of the most valuable and wearable gemstones of all-time. Sapphire is a 'precious four' gem and offers superb brilliance and rich, vibrant colors. Although most sapphire is heated or enhanced in other ways to improve color, clarity and stability, unheated and completely untreated natural sapphire can still be found. Usually unheated sapphire gems are found only in small sizes, but occasionally, large, clean stones are uncovered too. Because unheated sapphire is such a rarity, they are indeed relatively expensive, particularly unheated top-color blue 'Ceylon' sapphire. Unheated, natural sapphire is mostly sourced from Africa, though Australia and parts of Asia are known to produce some fine materials too.
As of recent times, Madagascar and Tanzania are two of the most important sources for fine untreated, unheated sapphire, as is Thailand. Tanzanian sapphire is usually pink to violet in color (often violet-blue), and many of the specimens exhibit very noticeable color change properties. Color-change unheated sapphire can be very expensive and is highly sought-after by both jewelers and gem collectors. Fine quality unheated sapphire gems from Madagascar, as well as Australia, display silk inclusions, which are highly desirable. The silky appearance is cause by rutile inclusions and the presence of such silk is usually a good indicator that the gem has not been heated, since rutile inclusions melt at a much lower temperatures than those at which sapphire is heated. Sapphire is also the official birthstone for those born in the month of September.
Certified Customer Reviews
Overall Rating -> 9
felt selecting what I wanted was easier and allowed me to find what I wanted.
When buying high-price items - like gems - it can be scary you are being scammed. GemSelect has no hidden strings. I tested this by purchasing very small, but they have won me over. Their prices are upfront and the quality is as expected. They also package their gems well, and ship incredibly quickly. Their website is easy to use, and they have quick customer service. Best eWholesaler.
I was looking for very specific loose gems for my collection and some loose gems to add to a piece of jewelry I want to have made and Gem Select had everything I was looking for and the selection and price ranges were outstanding. I will absolutely purchase from this vendor again and often. I am so very pleased with the items I received.