3.71-Carat Blue-Green Bicolored Montana Sapphire (Heated)

3.71-Carat Blue-Green Bicolored Montana Sapphire (Heated)


A beautiful blue and green bicolored heated Montana sapphire in my custom “Testudo” brilliant oval design, 3.71 carats.

In stock


This beautiful heated Montana sapphire is a unique combination of two colors, blue and green. The colors are in zones, creating a bicolored effect. This sapphire has been subject to traditional heat treatment in Montana to improve the color and clarity, but no other treatments have been applied. The treatment is permanent and stable.  This sapphire has slight inclusions that are just barely visible to the naked eye. I have factored the inclusions into the price, making this a great value for the size and color.

This sapphire is faceted in my custom “Testudo” brilliant oval design that I’ve created and optimized for sapphire; the result is a glittering beauty of a gemstone.  The gem weighs 3.71 carats and measures 10.1 x 7.7 x 6.2 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/