Square Cushion

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  • The "Dahlia" ring in platinum with a 2.14-carat orange Montana Sapphire sits beside the matching platinum "Dahlia" band, both shown on a green leaf. The "Earth's Treasury" logo appears at the bottom.The "Dahlia" ring in platinum with a 2.14-carat Montana sapphire stands upright on a textured surface, with a rough blue-green stone in the background.

    The “Dahlia” Ring

    $2,350.00

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  • 0.74-Carat Orange-Yellow Bicolored Montana Sapphire (Heated)

    0.74-Carat Orange-Yellow Bicolored Montana Sapphire (Heated)

    $700.00

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  • 1.19-Carat Teal Blue Montana Sapphire (Heated)

    1.19-Carat Teal Blue Montana Sapphire (Heated)

    $1,750.00

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  • A 1.62-carat rich blue-green-yellow particolored Montana Sapphire (heated) with a square cushion cut rests on a textured gray surface. The "EARTH'S TREASURY" logo is visible at the bottom.

    1.62-Carat Rich Blue-Yellow Particolored Montana Sapphire

    $3,650.00

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  • 2.48-Carat Medium Blue Montana Sapphire

    2.48-Carat Medium Blue Montana Sapphire

    $8,700.00

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  • 0.60-Carat Light Aqua Montana Sapphire

    0.60-Carat Light Aqua Montana Sapphire

    $600.00

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  • 0.71-Carat Light Aqua Blue Montana Sapphire

    0.71-Carat Light Aqua Blue Montana Sapphire

    $700.00

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  • The "Victoria" Ring in 14k rose and white gold features a 1.05-carat Montana Sapphire, surrounded by a double diamond halo and diamonds on the band, displayed on a green leaf with "Earth's Treasury" at the bottom.The "Victoria" Ring in 14k rose and white gold features a 1.05-carat Montana sapphire as the center stone, accented by small clear stones along the band. Displayed on a rough blue crystal with the "EARTH'S TREASURY" logo at the bottom.

    The “Victoria” Double Halo Ring

    $2,900.00

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  • The "Daphne" ring in 14k yellow gold, set with a 1.71-carat Montana sapphire, stands upright against a green leaf background. The Earth's Treasury logo is shown below.The "Daphne" ring in 14k yellow gold with a 1.71-carat Montana sapphire is shown upright on a textured blue stone, with "Earth's Treasury" branding below.

    The “Daphne” Solitaire

    $1,650.00

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  • The “Mari” ring in 14k yellow gold features a 1.63-carat Montana Sapphire center, encircled by small diamonds and beautifully displayed on a green leaf background.The “Mari” ring in 14k yellow gold with a 1.63-carat Montana Sapphire is shown on a rough blue stone, with the "Earth's Treasury" logo and text at the bottom.

    The “Mari” Ring

    $1,950.00

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  • A 14k yellow gold "Freya" ring with a 1.51-carat Montana sapphire, shown on a green leaf background. "Earth's Treasury" logo at the bottom.The "Freya" ring in 14k yellow gold with a 1.51-carat Montana sapphire is shown upright on rough blue mineral, with a patterned metallic background and the "Earth's Treasury" logo at the bottom.

    The “Freya” Solitaire

    $2,050.00

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  • The "Surya" ring in 18k yellow gold features a 1.46-carat Montana sapphire at the center, accented by clusters of small white stones, and is displayed on a green leaf with the "Earth's Treasury" logo below.The "Surya" ring in 18k yellow gold with a 1.46-carat Montana sapphire is displayed upright before a rough blue crystal on a textured gray surface. "EARTH'S TREASURY" is shown at the bottom.

    The “Surya” Ring

    $2,600.00

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  • A silver Roe, Ana ring featuring a triangular blue gemstone and small side diamonds rests on green leaves; the "Earth's Treasury" logo appears below.A Roe, Ana Ring featuring a silver band with a green gemstone stands upright on a textured metallic surface, with "EARTH'S TREASURY" displayed below.

    The “Adelaide” Ring

    $3,050.00

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  • 1.90-Carat Golden Yellow Montana Sapphire (Heated)

    1.90-Carat Golden Yellow Montana Sapphire (Heated)

    $2,850.00

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  • The ET1993, a square-cut purple gemstone with intricate facets, is elegantly displayed on a textured gray surface.

    1.53-Carat Magenta Purple to Intense Pink Color Change Garnet

    $1,250.00

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  • 0.93-Carat Teal Blue Montana Sapphire (Heated)

    0.93-Carat Teal Blue Montana Sapphire (Heated)

    $900.00

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  • 0.97-Carat Tsavorite Garnet in a square shape with faceted cuts on a textured gray surface.

    0.97-Carat Tsavorite Garnet

    $950.00

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  • A cushion-cut pale kiwi-green gemstone, weighing 0.47 carats, resting on a textured gray surface with the "Earth's Treasury" logo at the bottom.

    0.47-Carat Pale Kiwi Green Grossular Garnet

    $150.00

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  • A 0.71-carat mint green garnet with intricate faceting, showcased on a textured gray background. Text reads "Earth's Treasury" at the bottom of the image.

    0.71-Carat Mint Green Grossular Garnet

    $350.00

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  • A 1.63-carat Demantoid Garnet, with square cuts and reflective facets, sits on a textured gray surface.

    1.63-Carat Demantoid Garnet

    $1,800.00

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  • The "Venus" ring in 14k yellow gold with 1.44-Carat Montana SapphireThe "Venus" ring in 14k yellow gold with 1.44-Carat Montana Sapphire

    The “Venus” Ring

    $2,800.00

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  • The "Calliste" ring in 18K yellow gold with a 1.08-carat Montana sapphire from Calliste Jewelry is shown on a green and white striped plant stem, with the "EARTH'S TREASURY" logo at the bottom.The "Calliste" ring in 18K yellow gold with a 1.08-carat Montana sapphire is shown upright on a gray textured surface, with the "Earth's Treasury" logo and text at the bottom.

    The “Calliste” Solitaire

    $2,400.00

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    Select optionsDone This product has multiple variants. The options may be chosen on the product page
  • 0.71-Carat Aqua Blue Montana Sapphire (Heated)

    0.71-Carat Aqua Blue Montana Sapphire (Heated)

    $700.00

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  • 0.87-Carat Medium Blue Montana Sapphire (Heated)

    0.87-Carat Medium Blue Montana Sapphire (Heated)

    $650.00

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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.