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Custom Montana Sapphire Ring in Gold

Design your custom engagement ring with the Montana sapphire of your choice. Your ethical dream ring, made to order, just for you.


  • 18 karat yellow, rose or white gold
  • Our signature ethical gold: mercury-free and mined by indigenous women who are paid more than the international gold price
  • Ethically sourced sapphire from Montana, USA - September birthstone
  • A fully customized piece
  • Made to order in 8 to 12 weeks, plus shipping 

Email us for help and personal concierge service. 

Custom Montana Sapphire Ring in Gold

Design your own Montana sapphire engagement ring or self love ring. 

Choose a Montana sapphire that speaks to you and let's get started!

We’re making this for you, from scratch

Your custom Montana sapphire ring will be made to order with the Montana sapphire stone of your choice in around 8 to 12 weeks. You'll receive a photo before we ship it out. The price is for one finished ring in 18 karat eco gold.

Since your Montana sapphire ring will be made especially for you, we don’t accept returns on custom orders. You can read our return policy here.


Sapphire is the September birthstone. This original love rock is a powerful stone to gather strength. Sapphire symbolizes wisdom, loyalty, and faith. She was once believed to protect your loved ones from harm.

At first glance, sapphire gleams with power and strength, but her true colors shine within kindness and hope – that’s the stone’s real secret sauce. Sapphire lets us get real because she offers great wisdom of intuitive truth, insight, and healing. A symbol of friendship and peace, and a shield from negative energy

Sapphire is a durable gemstone with a hardness of 9 on Mohs scale of hardness. It’s suitable for everyday wear and as an alternative engagement ring.

Your custom ring design


You can choose from 18 karat yellow gold, rose gold or white gold. We use 18 karat ethical gold, which is mined and processed with traditional, mercury free, low impact practices by indigenous Dayak women in Central Kalimantan, Indonesian Borneo, who receive fair pay. Our white gold is rhodium plated.

Ring size

We use US ring sizes.


You can choose between a bezel setting, which has the gold all the way around the stone and a prong setting, where small claws hold the stone. Not sure which setting is right for you? Compare bezel vs prong setting here.

Diamonds in band

Want to add some extra sparkle? Pave diamonds in the ring band can really elevate the look of your ring. Choose between salt and pepper diamonds (the rebellious budget option) or white diamonds (G-H color, SI clarity).

Engraving is on us

We offer complimentary engraving on the inside of your ring to personalize it even more. Our team will reach out to you after your purchase for details.

Conflict free diamonds

The diamonds used in this jewelry have been purchased from legitimate sources not involved in funding conflict and in compliance with United Nations resolutions. Based on personal knowledge and/or written guarantees provided by the supplier of these diamonds they are conflict free and mined in accordance with the Kimberley Process.

Gardens of the Sun goes beyond conflict free. Since our sourcing policy came into effect in November 2018 we only purchase diamonds from known origins. We avoid sourcing diamonds from Angola, Democratic Republic of Congo, Ivory Coast, Liberia, Russia (last purchased in 2019), Sierra Leone and Zimbabwe.

Is it a Montana sapphire engagement ring?

Are you planning on using this as an engagement ring? Ask us to keep the exact measurements of your diamond. This way, if you decide to also get a wedding band or nesting band from us, we can help make sure it fits perfectly.

Need any help?

Want advice on which stone to choose, some guidance with the design, or a mock-up before taking the plunge? Our customer happiness team is pretty awesome! Contact them for help.

Any special requests for your ring band, stone angle or prong placement? Write them down in the box at checkout.

Montana sapphire for you to choose from

MS1 - 0.35 ct small green sapphire with hints of light blue

Beautiful precision cut by Kosnar Gems Co, unheated, mined in Rock Creek, Granite Co., Montana. Measures 4.1 x 4.1 x 3 mm.

MS2 - 0.38 ct small light green sapphire with brown inclusions

High-quality precision cut by Kosnar Gems Co, unheated, mined in Rock Creek, Granite Co., Montana. The inclusions look like small needles depending on the angle.Measures 4.1 x 4.1 x 2.8 mm.

MS3 - 0.34 ct icy mint green sapphire

Fantastic precision cut by Kosnar Gems Co, unheated, mined in Rock Creek, Granite Co., Montana. Measures 4.1 x 4.1 x 2.9 mm.

MS4 - 0.35 ct pale green sapphire with hints of golden yellow and touches of icy blue

High quality precision cut by Kosnar Gems Co, unheated, mined in Rock Creek, Granite Co., Montana. Measures 4.1 x 4.1 x 2.8 mm.

MS5 - 0.36 ct sparkling light blue sapphire

Amazing precision cut by Kosnar Gems Co, unheated, mined in Rock Creek, Granite Co., Montana. Measures 4.1 x 4.1 x 3 mm.

MS6 - 0.36 ct light golden green sapphire, with beautiful silky sparkle

High quality precision cut by Kosnar Gems Co, unheated, mined in Rock Creek, Granite Co., Montana. Measures measures 4.1 x 4.1 x 2.9 mm.

MS7 - 0.36 ct white sapphire with light blue dispersed throughout

The beauty of this sapphire is magnified by the magnificent cut. Unheated sapphire, mined in Rock Creek, Granite Co., Montana. Measures 4.1 x 4.1 x 3 mm.

MS8 - 0.37 ct striking denim blue with a small darker blue cloud and touches of green

Precision cut by Kosnar Gems Co, unheated, mined in Rock Creek, Granite Co., Montana. Measures 4.1 x 4.1 x 2.9 mm.

MS9 - 0.38 ct mint green Montana sapphire

Precision cut by Kosnar Gems Co, unheated, mined in Rock Creek, Granite Co., Montana. Measures 4.1 x 4.1 x 3 mm.

MS10 - 1.91 ct light blueish green Missouri River sapphire with mermaid vibes

Great size at nearly 2 carats. Some dark inclusions at the girdle and bits of silk. Unheated, cut in Sri Lanka. Measures 7.6 x 7.6 x 4.6 mm.

MS11 - 2.27 ct pale green Missouri River sapphire

I love how the inclusions of this huge Montana sapphire almost look like sparkling confetti inside the stone. Unheated, cut in Sri Lanka. Measures 7.8 x 7.9 x 5.3 mm.

MS12 - 1.61 ct light yellow sapphire with bits of blue.

Mined in Missouri River, unheated, cut in Sri Lanka. Measures 7.2 x 7.2 x 4.1 mm.

MS13 - 1.28 ct mermaid sapphire, greenish blue with sparkling rainbow inclusions

Missouri River, unheated, cut in Sri Lanka. Measures 7 x 7 x 3.4 mm.

MS14 - 1.45 ct pale golden blue Montana sapphire with small inclusions

The entire stone is shrouded in a clouded mistiness to it to the point where it has an almost opalescent glow. Missouri River, unheated, cut in Sri Lanka. Measures 7 x 7 x 4.1 mm.

MS15 - 1.09 ct light blue sapphire

The Missouri River, unheated, cut in Sri Lanka. Measures, measures 6.5 x 6.5 x 3.5 mm.

MS16 - 1.19 ct magical green sapphire, slightly more forest than mermaid

Missouri River, unheated, cut in Sri Lanka. Measures 6.6 x 6.6 x 3.6 mm.

MS17 - 1.37 ct silky pale yellow sapphire with black inclusions

Sourced from the Missouri River, unheated, cut in Sri Lanka. Measures 6.7 x 6.7 x 4.4 mm.

MS18 - 1.24 ct icy pale green sapphire

Sourced from Missouri River, unheated, cut in Sri Lanka. The color changes as you change the viewing angle of this stone.Measures 6.5 x 6.5 x 3.9 mm.

MS19 - 1.61 ct heavily included, icy light blue sapphire.

Missouri River, unheated, cut in Sri Lanka. The imperfect cut could be disguised by a bezel setting. Measures 6.9 x 6.9 x 4.4 mm.

MS20 - 1.03 ct iced pale golden blue sapphire.

A wonderfully intriguing stone with cloudy inclusions off center. Missouri River, unheated, cut in Sri Lanka. Measures 6.4 x 6.4 x 3.6 mm.

MS21 - 0.99 ct(sold)

MS22 - 0.96 ct a cloudy and silky light blue sapphire with warm yellow patches.

Mined around the Montana Missouri River, unheated, cut in Sri Lanka. Measures 6.1 x 6.1 x 3.6 mm.

MS23 - 1.13 ct icy blue with warm golden yellow inclusions

Missouri River, unheated, cut in Sri Lanka. A yellow gold setting would bring out the stone's color well. Measures  6.2 x 6.2 x 4 mm.

MS24 - 0.87 ct light blue Montana sapphire.

You won't regret this marvelous stone! Missouri River, unheated, cut in Sri Lanka. Measures 6 x 6 x 3.3 mm.

MS25 - 0.86 ct light blue sapphire, some silky streaks in the best of ways.

Missouri River, unheated, cut in Sri Lanka. Measures 5.6 x 5.6 x 3.7 mm.

MS26 - 0.78 ct pale blue sapphire with interesting inclusions.

Missouri River, unheated, cut in Sri Lanka. Measures 5.9 x 5.9 x 3 mm.

MS27 - 0.57 ct pale green sapphire.

Some honey yellow tinge is visible only at some angles, and a well defined black pepper inclusion. Missouri River, unheated, cut in Sri Lanka. Measures 4.9 x 5.7 x 2.6 mm.

MS28 - 0.43 ct icy pale yellow sapphire.

It's like white sapphire, but with a slightly yellow glow. Missouri River, unheated, cut in Sri Lanka. Measures 4.7 x 4.7 x 2.6 mm.

MS29 - 0.54 ct hexagon cut sapphire in a vivid Montana blue.

Heated for color. Mined and cut at the Gem Mountain sapphire mine, Montana's oldest sapphire mine. Measures 4.9 x 5.7 x 2.6 mm.

MS30 - 0.16 ct tiny but mighty octagon cut Montana sapphire.

Heated. Measures 3.1 x 3.1 x 2.1 mm.

MS31 - 0.23 ct light yellow and blue hexagon cut sapphire

Vintage Montana stock, heated. Measures 3.6 x 4.1 x 2.2 mm.

MS32 - 0.23 ct yellow and blue sapphire.

The dispersion of color makes the stone appears vibrant blueish green. Montana, heated, hexagon cut. Measures 3.4 x 3.8 x 2.2 mm.

MS33 - 0.22 ct green and blue hexagon cut Montana sapphire.

Heated for color. Measures 3.8 x 3.5 x 2.2 mm.

MS34 - 0.23 ct deep blue and green Montana sapphire with hexagon cut.

Heated. Measures 3.6 x 4 x 2.3 mm.

MS35 - 0.33 ct unique bicolor hexagon sapphire with different shades of blue.

Heated. Measures 4.6 x 4.0 x 2.6 mm.

MS36 - 0.53 ct light green and Montana blue hexagon sapphire.

Heated, measures 4.7 x 5.2 x 3 mm.

MS37 - 0.37 ct yellow hexagon sapphire with some blue around the girdle and a defined black pepper inclusion.

Heated. Measures 4.2 x 4.2 x 2.7 mm.

MS38 - 0.32 ct deep mermaid blue sapphire.

Hexagon cut, Montana mined, heated, measures 4 x 4 x 2.5 mm.

MS39 - 0.34 ct wonderful green octagon sapphire from Montana.

Heated, measures 4.1 x 4.1 x 2.6 mm.

MS40 - 0.56 ct Asscher cut blue Montana sapphire.

Heated for color, measures 4.4 x 4.4 x 2.9 mm.

MS41 - 0.70 ct heavily included icy sapphire from Montana, with some wicked copper colored needles.

Heated, measures 5.24 x 5.24 x 3.71 mm.

MS42 - 1.40 ct octagon cut bicolor Montana sapphire.

Comes in a soft grayish blue shade with crazy streaks of golden orange and copper needles. Heated, measures 5.1 x 5.8 x 4.6 mm

The latest addition, unheated:

MS43 - 1.38 ct mint sapphire.

An opulent flash of yellow dashes through this lush minty sapphire, scissor cut to show its unique coloring as it glistens on every side under the sun. Measures 6.82 x 4.92 x 4.23 mm.

MS44 - 0.42 ct emerald cut blue sapphire.

A cut of the beach blue sky is frozen just for you in this emerald cut sapphire. A playful sweetheart overflowing with love.Measures 4.62 x 4.08 x 3.00 mm.

MS45 - 0.47 ct blue sapphire.

Confidence is owned, not gained. This blue sapphire understands what it means to be comfortable in its own skin. Measures 4.89 x 3.47 x 3.30 mm

MS46 - 0.45 ct ice blue sapphire.

Ice, ice baby.This cool cat is a statement and a half, out to conquer the world. Measures 4.94 x 4.08 x 2.73 mm.

MS47 - 0.51 ct blue sapphire

Twinkle and a wink, a mischievous presence that just wants to have fun, and will remind you to just let loose. Measures 4.11 x 4.04 x 3.42 mm.

MS48 - 0.44 ct emerald cut blue sapphire.

This emerald cut sapphire is sweet and soft, like a lazy day spent in a cocoon of blankets and pillows. Measures 4.46 x 4.06 x 2.82 mm.

MS49 - 0.48 ct blue sapphire

A true blue bestie of a sapphire, fiercely loyal and stunning to boot. Perfect for that dream ring you want to wear forever. Measures 4.49 x 4.15 x 2.90 mm.

MS50 - 0.54 ct light blue sapphire.

Sunshine filtered through a calm sea, this light blue sapphire is still waters and serenity.Measures 4.96 x 3.71 x 3.14 mm.


MS51 - 0.76 ct cyan Montana sapphire.

Elegantly flirtatious, this elongated hexagon shaped cyan Montana sapphire is just oozing with charm. Turning heads 180 degrees will just be another Monday. Measures 6.10 x 4.30 x 3.80 mm.

MS52 - 0.68 ct blue Montana sapphire.

A swirl of blue ink in water, this Montana sapphire is bursting with creativity. With a bubble floating towards the surface. It might be an imperfection, it might be a gem of an idea. Measures 6.40 x 4.33 x 3.04 mm.

MS53 - 0.53 ct emerald cut blue sapphire.

Fractured fever dreams are just begging to be put together in this emerald cut Montana sapphire. Brilliantly blue and deliciously dark. Measures 6.50 x 3.56 x 2.35 mm.

MS54 - 0.60 ct hexagon Montana sapphire.

A hexagon cut Montana sapphire that brings on lazy summer memories rolling down grassy slopes, colored like grass stains on your favorite pair of faded jeans. Measures 6.11 x 3.73 x 2.92 mm.

Customer Reviews

Based on 199 reviews
Ciara (Nevada, United States)
The perfect engagement ring!

My fiancé and I picked out my engagement ring from Gardens of the Sun and I couldn’t be happier with it. The process of picking out the stone, setting and band was so much fun, and the team at Gardens of the Sun was so helpful in sending pictures and mock-ups! I’ve received so many compliments on my ring, and it’s so beautiful and unique!

Heléne (Kronoberg County, Sweden)
Easy process and good advice

I have only the best to say about the company and the special piece for myself that I created with them. It is every bit so special and beautyful as I could hope and expect. And the customer-service is flawless with quick and easy contacts and good advice (especially since I got second thoughts about wich size to choose).

Samantha M. (Ohio, United States)
The most unique wedding set

I dreamed of owning a hexagon diamond ring by Gardens of the Sun, years before my proposal. When it became my time to design my custom set, the team could not have been more helpful in creating a unique piece of wearable art. Maharani suggested a silver wedding band with blue sapphires to compliment my hexagon salt & pepper diamond ring set in gold - and while I had not originally envisioned my gold ring with a silver band, I was truly blown away by the end result! The rings just fit together so perfectly, and compliment each other in the most gorgeous way. I get compliments daily on how beautiful my ring set is! I've never seen another set quite like mine, and I love it even more knowing that it was designed specifically for me. Thank you to the Gardens of the Sun team for creating such a magical, dreamy set of jewelry that I will cherish for a lifetime!!

Ivor C.
Two rings, a story, and a lot of heart.

Like every good love story, we wanted our wedding and engagement rings to be unique and true to the love that inspired them. That's a lot to ask of jewelry, and I truly believe that Gardens of the Sun is the only company that could live up to that lofty vision. Friends and family are sick to death of us talking about our rings, but every time I look at my finger I smile, and what kind of value can you place on that? The entire experience was a delight. Thank you GOTS team. We love your impeccable work!