Square Cushion

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  • The "Firenze" ring, expertly crafted in 18k yellow gold, features a 0.61-carat Montana sapphire center stone accented by two clear side stones. The ring is displayed on a rough blue-green mineral, with the "Earth's Treasury" text below.Presenting the "Firenze" ring in 18k yellow gold, showcasing a 0.61-carat Montana sapphire at its center and accented by two rectangular clear stones. Displayed elegantly atop a rough dark blue crystal, this striking piece is ready to ship.

    The “Firenze” Ring

    $4,950.00

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    Select optionsDone This product has multiple variants. The options may be chosen on the product page
  • A 1.91-carat square cushion-cut blue Montana sapphire is displayed on a textured gray surface with "Earth's Treasury" below.

    1.91-Carat Teal-Blue Particolored Montana Sapphire

    $6,400.00

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  • A 1.21-carat cushion-cut blue sapphire rests on a textured surface above the “Earth’s Treasury” logo.

    1.21-Carat Royal Blue Ceylon Sapphire (Heated)

    $2,800.00

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  • A 1.74-carat Spessartine garnet with vivid orange facets sits on a textured gray surface, featuring the "Earth's Treasury" name and hexagon logo at the bottom.

    1.74-Carat Orange Spessartine Garnet

    $1,300.00

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  • A 2.56-carat cushion-cut spessartine garnet with vivid red hues is shown on a gray, textured surface, featuring the text "EARTH'S TREASURY" at the bottom.

    2.56-Carat Rich Orange Spessartine Garnet

    $2,000.00

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  • A 1.35-carat spessartine garnet, faceted in a vibrant orange-yellow hue, rests on a textured metallic surface with "EARTH'S TREASURY" displayed at the bottom.

    1.35-Carat Light Orange Spessartine Garnet

    $800.00

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  • A 1.85-carat Spessartine garnet sits on a textured gray surface, with the "EARTH'S TREASURY" logo and text displayed beneath the gemstone.

    1.85-Carat Light Orange Spessartine Garnet

    $750.00

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  • A faceted green 1.09-carat tourmaline with a square cushion cut rests on a textured gray surface; "Earth's Treasury" is printed at the bottom.

    1.09-Carat Green-Aqua Particolored Tourmaline

    $900.00

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  • A 1.45-carat teal-blue tourmaline with a square cushion cut is displayed on a textured gray surface. "EARTH'S TREASURY" appears at the bottom of the image.

    1.45-Carat Deep Blue-Green Tourmaline

    $1,200.00

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  • A 1.63-carat heated Montana sapphire with a cushion cut is displayed on a textured gray surface, featuring the "Earth's Treasury" logo and text at the bottom.

    1.63-Carat Medium Blue to Purple Color Change Montana Sapphire (Heated)

    $3,100.00

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  • A 1.12-carat heated Montana sapphire with a cushion cut and blue-green hue rests on a textured grey surface featuring the "Earth's Treasury" logo and text at the bottom.

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

    $1,700.00

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  • A 1.58-carat cushion-cut heated Montana sapphire with geometric facets is displayed on a textured gray surface, with the "EARTH'S TREASURY" logo and text below.

    1.58-Carat Sky Blue Montana Sapphire (Heated)

    $2,700.00

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  • A 1.98-carat heated Montana sapphire with a cushion cut in teal blue is showcased on a textured light gray background, featuring the "Earth's Treasury" text below.

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

    $2,950.00

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  • A 2.02-carat heated Montana sapphire with a cushion cut is shown on a textured surface, featuring the text "EARTH'S TREASURY" at the bottom.

    2.02-Carat Teal-Aqua Particolored Montana Sapphire (Heated)

    $6,700.00

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  • A 3.19-carat heated Montana sapphire, shimmering blue-green, rests on a textured surface with "Earth's Treasury" and its logo visible at the bottom of the image.

    3.19-Carat Aqua-Teal Particolored Montana Sapphire (Heated)

    $5,100.00

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  • A 3.26-carat, cushion-cut Montana sapphire (heated) in deep blue, displayed on a textured light gray surface with "EARTH'S TREASURY" at the bottom.

    3.26-Carat Teal Montana Sapphire (Heated)

    $4,500.00

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  • A Custom ring in platinum with a 1.27-carat Montana sapphire center, surrounded by small clear diamonds, is displayed on a green leaf.The "Celisse" ring in platinum, featuring a 1.27-carat Montana sapphire, is displayed on a rough blue mineral, with the "Earth's Treasury" logo below.

    The “Celisse” Halo Ring

    $2,200.00

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    Select optionsDone This product has multiple variants. The options may be chosen on the product page
  • The "Josephine" ring in 18K white gold, featuring a 1.60-carat Ceylon sapphire with a prong-set halo of diamonds, is displayed on a blue-green gemstone against a patterned gray background with the "Earth's Treasury" logo below.The "Josephine" ring in 18K white gold, featuring a 1.60-carat Ceylon sapphire with a prong-set halo of diamonds, is displayed on a blue-green gemstone against a patterned gray background with the "Earth's Treasury" logo below.

    The “Josephine” Halo Ring

    $3,100.00

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  • A 3.24-carat faceted green sapphire with intricate internal patterns is displayed on a textured surface, with the "Earth's Treasury" logo at the bottom.

    3.24-Carat Forest Green Sapphire

    $5,600.00

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  • A 1.19-carat heated Montana sapphire, expertly square-cut with intricate facets, rests on a textured gray surface. “EARTH’S TREASURY” is displayed at the bottom.

    1.19-Carat Teal-Aqua Particolored Montana Sapphire (Heated)

    $1,750.00

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  • A faceted, vivid blue 40.58-carat Tanzanite gemstone with geometric cuts rests on a textured surface, labeled "EARTH'S TREASURY" at the bottom.

    40.58-Carat Vivid Bluish Violet Tanzanite

    $32,500.00

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  • A 1.23-carat cushion-cut Montana sapphire (heated) displayed on a textured gray surface, with the text "EARTH'S TREASURY" below.

    1.23-Carat Light Sky Blue Montana Sapphire (Heated)

    $1,850.00

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  • The "Aralia" ring in platinum, featuring a 1.03-carat Montana sapphire and leaf details, is shown on a green plant stem with the Earth’s Treasury logo below.The "Aralia" ring in platinum with a 1.03-carat Montana sapphire stands upright, displaying its band and setting, with a rough blue stone behind it on a patterned surface. The Earth's Treasury logo appears below.

    The “Aralia” Ring

    $2,150.00

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    Select optionsDone This product has multiple variants. The options may be chosen on the product page
  • The Deluxe "Ivey" ring in 14k yellow gold with a 1.58-carat Australian sapphire, featuring an intricate leaf and vine design, is displayed on a green plant stem. Below it appears the text "EARTH'S TREASURY.The Deluxe "Ivey" ring in 14k yellow gold with a 1.58-carat Australian sapphire stands upright against a blue textured surface, displayed before a geometric patterned background with the Earth's Treasury logo below.

    The Deluxe “Ivey” Ring

    $2,100.00

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    Select optionsDone This product has multiple variants. The options may be chosen on the product page

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.