3.43-Carat Rich Blue Montana Sapphire (Heated)


A beautiful rich blue heated Montana sapphire in my custom Aurora brilliant square cushion design, quite large for Montana sapphire at 3.43 carats.

In stock


This beautiful heated Montana sapphire is a gorgeous rich blue color–it represents some of the finest blue color to be found in the Montana gems.  The color was developed by heating the gem in Montana, but no other treatments were made to the gem.  The treatment is permanent and stable and not only develops the color, but also improves the clarity.   There are some minor tiny inclusions and a feather in this gem; they very slightly decrease the brilliance of the gem, but are too tiny to be seen without a loupe–its an eye clean gemstone. That said, its still a very bright and flashy gem in the hand, and very large for Montana–only a handful of gems mined each year are large enough to create a gem this size.  I have factored the inclusions into the price of this gem, making it a good value for the color, size and rarity.

This sapphire is faceted in my custom “Aurora” brilliant square cushion design that I’ve designed and optimized for sapphire; the result is a glittering beauty of a gemstone.  The gem weighs 3.43 carats and measures 7.8 x 6.0 mm.  It would make an amazing center stone for a unique and one-of-a-kind engagement ring.

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Product Enquiry

Do your gems come with certificates?

We're often asked about this, and yes, we do include our own certificate of origin and authenticity.  You can learn more here: https://www.earthstreasury.com/what-about-a-certificate/

Can I have a custom piece of jewelry made?

We LOVE making custom jewelry for our clients!  You can learn more about how the process works here: https://www.earthstreasury.com/the-custom-jewelry-process/

What is your return policy?

We have a one-week review and return policy that starts the date you receive your gem.  We want you to be 100% sure you have the right gem.  Learn more here: https://www.earthstreasury.com/risk-free-review-and-return-policy/