1.70-Carat Blue-Green Montana Sapphire

1.70-Carat Blue-Green Montana Sapphire



A beautiful blue-green unheated Montana sapphire in my custom Helena brilliant oval design, 1.70 carats.

In stock


This lovely unheated Montana sapphire is a beautiful rich blue-green color–green tinted with blue.  The color can shift with the lighting, looking more blue or more green depending on the color of the lighting.  The sapphire is very clean with just a few tiny inclusions visible in the macro image, but not visible in the hand without a 10x loupe.  It has a light amount of very fine natural rutile silk, softening the brilliance just a tiny bit, but it is much less noticeable than the photo makes it appear.  In the hand its a gorgeous and scintillating gemstone.

This sapphire is faceted in my custom “Helena” oval brilliant design that I’ve designed and optimized for sapphire; the result is a glittering beauty of a gemstone.  The gem weighs 1.70 carats and measures 7.3 x 6.1 x 4.9 mm.  It would make an beautiful center stone for a unique and one-of-a-kind engagement ring.

Additional information



AGTA Enhancement Code

Gemstone Origin

Gemstone Shape

Gem Carat Weight

Gemstone Design

Gemstone Artist

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/