Square Cushion

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  • The "Snowflake" ring in 18K yellow gold, hammered and polished, featuring a 1.80-carat Montana sapphire, stands upright on a green leaf with the Earth's Treasury logo below—evoking the style of Snowflake Solitaire.The "Snowflake" ring in 18K yellow gold, hammered and polished, with a 1.80-carat Montana sapphire is displayed upright on a blue rough stone atop a textured surface, with the Earth’s Treasury logo at the bottom.

    The “Snowflake” Solitaire

    $1,700.00

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  • The "Mavis" ring in 14K white gold showcases a 1.02-carat Montana sapphire center and two triangular clear stones, beautifully set against a green leaf background.The "Mavis" ring in 14K white gold with a 1.02-carat Montana sapphire is shown upright on a blue stone, with the "Earth's Treasury" logo beneath on a textured background.

    The “Mavis” Three-Stone Ring

    $2,700.00

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  • The "Hesperia" ring in 14K yellow gold features a 2.21-carat Montana sapphire and small round diamonds, shown on a green leaf with the Earth's Treasury logo below.The "Hesperia" ring in 14K yellow gold showcases a 2.21-carat Montana sapphire and side baguette stones, shown upright with a rough blue mineral and the Earth’s Treasury logo in the background.

    The “Hesperia” Ring

    $2,200.00

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  • A 1.52-carat sky blue Montana Sapphire (heated) with a radiant cut and starburst pattern rests on a textured gray surface, featuring the "Earth’s Treasury" logo below.

    1.52-Carat Sky Blue Montana Sapphire (Heated)

    $3,300.00

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  • A 1.89-carat medium blue heated Montana Sapphire with intricate facets is displayed on a textured surface, with the "EARTH'S TREASURY" logo visible below the gem.

    1.89-Carat Medium Blue Montana Sapphire (Heated)

    $4,200.00

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  • A platinum "Merope" ring featuring a 1.42-carat Ceylon sapphire and two pear-shaped clear stones, displayed on a green leaf background with "Earth's Treasury" branding below.A platinum "Merope" ring featuring a 1.42-carat Ceylon sapphire and two clear side stones stands upright on a textured gray surface, with the "Earth's Treasury" logo below.

    The “Merope” Three-Stone Ring

    $2,450.00

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  • The "Wisteria" 3.0 ring in 14k yellow gold features a 1.14-carat Montana sapphire between two white diamonds, shown against green leaves with the "Earth's Treasury" logo at the bottom.The "Wisteria" 3.0 ring in 14k yellow gold featuring a 1.14-carat Montana sapphire stands upright on a rough stone surface, viewed from the base, with the Earth's Treasury logo at the bottom.

    The “Wisteria” Three-Stone Trellis Ring

    $2,100.00

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  • A Le Renard, Yann engagement ring with a blue gemstone cushion cut center and baguette side stones is displayed on a green leaf; the "Earth's Treasury" logo appears at the bottom.The Le Renard, Yann ring, featuring a rectangular blue gemstone set in silver, stands upright on textured blue stone with the Earth's Treasury logo beneath.

    The “Clio” Three-Stone Ring

    $2,450.00

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  • A square-cut gemstone with intricate facets rests on a textured surface, featuring the Earth's Treasury logo at the bottom.

    1.88-Carat Light Pink Tourmaline

    $750.00

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  • A square-cut pink gemstone with intricate facets, displayed on a textured gray surface, is paired with the text "Earth's Treasury," accompanied by the model identifier "ET1600" at the bottom.

    1.98-Carat Light Pink Tourmaline

    $790.00

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  • A white Montana sapphire in our "Aurora" square cushion design

    1.24-Carat Near Colorless Montana Sapphire

    $1,240.00

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  • The "Arethusa" ring in platinum features a 2.65-carat round Montana sapphire and smaller clear stones along the band, shown on a green leaf with "Earth's Treasury" below—an exquisite, nature-inspired jewelry design.The "Arethusa" ring in platinum, featuring a 2.65-carat Montana sapphire, is displayed upright on a textured surface with the Earth's Treasury logo at the bottom.

    The “Arethusa” Ring

    $2,800.00

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  • The "Meissa" ring in 14K white gold with a 1.47-carat Montana sapphire and diamond band rests on a green leaf, with the Earth's Treasury logo visible at the bottom of the image.The "Meissa" ring in 14K white gold with a 1.47-carat rectangular Montana sapphire stands upright, a blue textured stone behind it and the Earth’s Treasury logo below.

    The Classic Pave “Meissa” Ring

    $2,450.00

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  • A 1.43-carat rich blue heated Montana Sapphire with intricate facets rests on a textured gray surface; "Earth's Treasury" appears below the gemstone.

    1.43-Carat Rich Blue Montana Sapphire (Heated)

    $2,900.00

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  • The faceted Medium Blue Montana Sapphire, product MS2237, rests on a textured light surface with "Earth's Treasury" and a hexagon logo shown below.

    1.50-Carat Medium Blue Montana Sapphire (Heated)

    $3,300.00

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  • A 1.95-carat medium blue Montana Sapphire (heated), cushion-cut with geometric facets, sits on a textured gray surface. "Earth's Treasury" appears at the bottom of the image.

    1.95-Carat Medium Blue Montana Sapphire (Heated)

    $4,400.00

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  • A 2.23-carat Deep Peacock Blue Montana Sapphire (Heated) in cushion cut is shown on a textured gray surface with "EARTH'S TREASURY" text and logo beneath.

    2.23-Carat Deep Peacock Blue Montana Sapphire (Heated)

    $5,600.00

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  • The "Calypso" ring in platinum showcases a 2.10-carat Montana sapphire, accented by smaller blue stones and marquise-shaped white details, elegantly displayed on a green plant leaf.The "Calypso" ring in platinum with a 2.10-carat Montana sapphire stands upright before a rough blue stone on textured gray, with the "Earth's Treasury" logo at the bottom.

    The “Calypso” Ring

    $2,600.00

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  • A blue Montana sapphire in our "Stella" square cushion design

    1.06-Carat Aqua Blue Montana Sapphire (Heated)

    $1,400.00

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  • A blue Montana sapphire in our "Stella" square cushion design

    0.96-Carat Medium Blue Montana Sapphire (Heated)

    $1,400.00

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  • 1.40-Carat Medium Blue Montana Sapphire (Heated)

    1.40-Carat Medium Blue Montana Sapphire (Heated)

    $1,900.00

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  • A 1.43-carat sky blue Montana sapphire (heated), cushion-cut, is showcased on a textured gray surface with "Earth's Treasury" displayed below.

    1.43-Carat Sky Blue Montana Sapphire (Heated)

    $2,800.00

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  • A 1.49-carat deep blue-green Montana Sapphire (heated) with a cushion cut is displayed on a textured gray surface, featuring the text "Earth's Treasury" beneath it.

    1.49-Carat Deep Blue-Green Montana Sapphire (Heated)

    $2,900.00

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  • 1.90-Carat Peacock Blue Montana Sapphire (Heated)

    1.90-Carat Peacock Blue Montana Sapphire (Heated)

    $1,200.00

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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.