Square Cushion

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  • 1.20-Carat Peacock Blue Montana Sapphire (Heated)

    1.20-Carat Peacock Blue Montana Sapphire (Heated)

    $900.00

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  • A 1.78-carat medium blue heated Montana Sapphire with a cushion cut rests on a textured gray surface, "EARTH'S TREASURY" displayed below.

    1.78-Carat Medium Blue Montana Sapphire (Heated)

    $1,700.00

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  • 1.38-Carat Sky Blue Montana Sapphire (Heated)

    1.38-Carat Sky Blue Montana Sapphire (Heated)

    $1,650.00

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  • 1.13-Carat Blue-Aqua Particolored Montana Sapphire (Heated)

    1.13-Carat Blue-Aqua Particolored Montana Sapphire (Heated)

    $1,250.00

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  • A 1.66-carat blue-teal particolored Montana Sapphire (heated), cushion-cut with intricate facets, rests on a textured gray surface above the Earth's Treasury logo.

    1.66-Carat Blue-Teal Particolored Montana Sapphire (Heated)

    $3,750.00

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  • A 1.60-carat light violet Ceylon sapphire on a textured surface, labeled "Earth's Treasury.

    1.60-Carat Light Violet Purple Ceylon Sapphire

    $3,100.00

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  • An 18k yellow gold "Cassandra" ring featuring a 1.79-carat Montana sapphire, encircled by clear diamonds, showcased on a green leaf with the "EARTH'S TREASURY" logo at the bottom.The "Cassandra" ring in 18k yellow gold with a 1.79-carat Montana sapphire is displayed upright on a dark rough stone atop a textured gray surface, with the "Earth's Treasury" logo and text at the bottom.

    The “Cassandra” Halo Ring

    $2,700.00

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  • 0.71-Carat Midnight Blue Australian Sapphire (Heated)

    0.71-Carat Midnight Blue Australian Sapphire (Heated)

    $600.00

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  • The "Harmonia" ring in 14k rose gold with 1.55-Carat Montana sapphireThe "Harmonia" ring in 14k rose gold with 1.55-Carat Montana sapphire

    The “Harmonia” Three-Stone Ring

    $2,150.00

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  • The "Aubrey" ring in 14K yellow gold, featuring a 3.37-carat Montana sapphire, is displayed upright against a green bamboo background.The "Aubrey" ring in 14K yellow gold, featuring a 3.37-carat Montana sapphire and hidden halo, is showcased on a rough blue stone atop a textured gray surface with the "Earth’s Treasury" logo below.

    The “Aubrey” Hidden Halo Solitaire

    $1,900.00

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  • The "Keeley" ring in 14k yellow gold with 1.61-Carat Montana sapphireThe "Keeley" ring in 14k yellow gold with 1.61-Carat Montana sapphire

    The “Keeley” Diamond-Accented Solitaire

    $2,600.00

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  • The "Apollo" ring features a 1.35-carat Montana sapphire set in 14K yellow gold, displayed elegantly on a green and silver background.The "Apollo" ring in 14K yellow gold with a 1.35-carat Montana sapphire is displayed on a rough crystal, with the "Earth's Treasury" logo below.

    The “Apollo” Ring

    $3,300.00

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  • A close-up of "The Ezra Ring" showcasing its silver band and blue hexagon-shaped gemstone with intricate facets. The ring is placed on a green background, with the text "EARTH'S TREASURY" visible at the bottom of the image.A silver ring named "Ezra," adorned with a blue gemstone, is set against a textured gray and blue stone backdrop. The ring features a unique geometric design, showcasing the blue gemstone in a modern, angled setting. The image includes the text "Earth's Treasury" at the bottom.

    The “Ezra” Ring

    $3,100.00

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  • The "Gawain" ring, crafted in unplated 18k palladium white gold with a 0.79-carat Montana sapphire, features geometric patterns along the band and is displayed on a green textured surface.The "Gawain" ring, crafted in unplated 18k palladium white gold with a 0.79-carat Montana sapphire, is shown upright on a textured gray surface. The Earth's Treasury logo appears at the bottom.

    The “Gawain” Ring

    $2,500.00

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  • The "Hermes" ringThe "Hermes" ring

    The “Hermes” Ring

    $3,300.00

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  • A platinum "Declan" ring with a 1.02-carat Montana sapphire, featuring vibrant orange and green hues, displayed on a green leaf with "EARTH'S TREASURY" below.The "Declan" ring in platinum, featuring a 1.02-carat Montana sapphire, stands upright on a textured surface with blue glass beneath it. The Earth's Treasury logo is displayed at the bottom.

    The “Declan” Ring

    $2,500.00

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  • The "Alexia" ring in 14k white gold with 0.99-Carat Montana SapphireThe "Alexia" ring in 14k white gold with 0.99-Carat Montana Sapphire

    The “Alexia” Halo Ring

    $3,100.00

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  • The "Cordelia" ring in 14K rose gold showcases a 1.38-carat Montana sapphire surrounded by small diamonds, set upright on a dark mineral rock with “Earth’s Treasury” branding below.The "Cordelia" ring in 14K rose gold showcases a 1.38-carat Montana sapphire surrounded by small diamonds, set upright on a dark mineral rock with “Earth’s Treasury” branding below.

    The “Cordelia” Halo Ring

    $2,450.00

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  • The "Lorelei" ring in platinum with 3.59-carat Ceylon sapphireThe "Lorelei" ring in platinum with 3.59-carat Ceylon sapphire

    The “Lorelei” Halo Ring

    $3,500.00

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  • The "Damara" ring in 18k yellow gold showcases a 2.44-carat Madagascar sapphire center stone, accented by two clear stones, elegantly displayed atop a rough blue mineral on a textured gray surface.The "Damara" ring in 18k yellow gold showcases a 2.44-carat Madagascar sapphire center stone, accented by two clear stones, elegantly displayed atop a rough blue mineral on a textured gray surface.

    The “Damara” Three-Stone Ring

    $3,850.00

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  • The "Mavis" ring in 14k yellow gold, upgraded with 4.5mm diamonds, with 2.09-carat Montana sapphireThe "Mavis" ring in 14k yellow gold, upgraded with 4.5mm diamonds, with 2.09-carat Montana sapphire

    The Cathedral “Mavis” Three-Stone Ring

    $2,700.00

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  • The “Guinevere” ring in platinum with 2.13-carat Montana sapphireThe “Guinevere” ring in platinum with 2.13-carat Montana sapphire

    The “Guinevere” Solitaire

    $2,100.00

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  • A platinum "Winnie" ring featuring a 0.95-carat Montana sapphire, beautifully set against a vibrant green leaf backdrop in a twisted design.The "Winnie" ring, crafted in platinum with a 0.95-carat Montana sapphire, elegantly displayed on a textured blue-green surface like the soothing notes of music.

    The “Winnie” Solitaire

    $1,800.00

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  • A platinum "Ripple" ring featuring a 1.23-carat Montana sapphire stands upright on a green leaf, with the Earth’s Treasury logo at the bottom.The "Ripple" ring in platinum, featuring a 1.23-carat Montana sapphire, is shown on a rough blue stone with a patterned gray background. "EARTH'S TREASURY" is displayed at the bottom.

    The “Ripple” Solitaire

    $1,700.00

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Natural Gemstone Jewelry & Loose Gemstones at Earth’s Treasury

At Earth’s Treasury, we make finding your color easy with one of the widest selections of ethically sourced gemstones available, from Montana sapphires and garnets to tourmaline and emeralds. Our team of talented designers and jewelers is dedicated to creating custom gemstone jewelry that’s as unique as your story. Whether you’re drawn to classic pieces or dream up a one-of-a-kind engagement ring, we’ll guide you every step of the way to ensure your jewelry feels personal, original, and entirely you.