Square Cushion

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  • 0.88-Carat Teal Blue Montana Sapphire (Heated)

    0.88-Carat Teal Blue Montana Sapphire (Heated)

    $850.00

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  • 0.95-Carat Teal Blue Montana Sapphire (Heated)

    0.95-Carat Teal Blue Montana Sapphire (Heated)

    $850.00

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  • 1.11-Carat Golden Yellow Montana Sapphire (Heated)

    1.11-Carat Golden Yellow Montana Sapphire (Heated)

    $1,400.00

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  • 1.01-Carat Medium Blue Montana Sapphire (Heated)

    1.01-Carat Medium Blue Montana Sapphire (Heated)

    $1,800.00

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  • A 1.02-carat Rich Sky Blue Montana Sapphire (Heated) with a cushion cut rests on a textured gray surface, the "Earth's Treasury" logo displayed below.

    1.02-Carat Rich Sky Blue Montana Sapphire (Heated)

    $1,950.00

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  • A 1.28-carat Peacock Blue Montana Sapphire (Heated) with a cushion cut rests on a textured gray surface; "EARTH'S TREASURY" appears at the bottom.

    1.28-Carat Peacock Blue Montana Sapphire (Heated)

    $2,400.00

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  • A 1.34-Carat Peacock Blue Montana Sapphire (Heated), cushion-cut with geometric facets, rests on a textured gray surface. The Earth’s Treasury logo is shown at the bottom of the image.

    1.34-Carat Peacock Blue Montana Sapphire (Heated)

    $2,100.00

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  • 1.36-Carat Teal Blue Montana Sapphire (Heated)

    1.36-Carat Teal Blue Montana Sapphire (Heated)

    $950.00

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  • A 1.46-carat rich blue heated Montana Sapphire with a geometric cut rests on a textured gray background, "EARTH'S TREASURY" printed underneath.

    1.46-Carat Rich Blue Montana Sapphire (Heated)

    $2,900.00

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  • 1.50-Carat Teal Blue Montana Sapphire (Heated)

    1.50-Carat Teal Blue Montana Sapphire (Heated)

    $3,000.00

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  • The 1.56-Carat Peacock Blue Montana Sapphire (Heated), cushion-cut, rests elegantly on a textured gray surface, with the Earth’s Treasury logo and text beneath.

    1.56-Carat Peacock Blue Montana Sapphire (Heated)

    $2,400.00

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  • A 1.76-carat medium blue heated Montana Sapphire with a cushion cut rests on a textured gray surface, with the "Earth's Treasury" logo and name displayed at the bottom.

    1.76-Carat Medium Blue Montana Sapphire (Heated)

    $4,400.00

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  • A particolored Montana sapphire in our "Stella" square design

    1.83-Carat Deep Blue-Gold Particolored Montana Sapphire (Heated)

    $3,200.00

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

    1.91-Carat Deep Peacock Blue Montana Sapphire (Heated)

    $5,250.00

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    Add to cartDone
  • The "Ismene" ring in 14k white gold with a 1.29-carat Montana sapphire is displayed on a green leaf, featuring a diamond-encrusted band and the text "Earth's Treasury" below.The “Ismene” ring in 14k white gold with a 1.29-carat Montana sapphire is displayed upright against a rough blue crystal on a textured surface, featuring the "Earth's Treasury" logo at the bottom.

    The Petite Pave “Ismene” Halo Ring

    $2,600.00

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    Select optionsDone This product has multiple variants. The options may be chosen on the product page
  • The "Kristen" ring in 14K white gold with 1.03-carat Montana sapphireThe "Kristen" ring in 14K white gold with 1.03-carat Montana sapphire

    The Petite Pave “Kristen” Halo Ring

    $2,600.00

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    Select optionsDone This product has multiple variants. The options may be chosen on the product page
  • The "Pleione" ring in 14K white gold features a 1.31-carat pear-shaped Montana sapphire with a diamond halo and tapered pavé, shown on a green background with “Earth’s Treasury” text below.The "Pleione" ring in 14K white gold with a 1.31-carat Montana sapphire is displayed upright on a textured gray surface, featuring the Earth's Treasury logo at the bottom.

    The Tapered Pave “Pleione” Halo Ring

    $2,800.00

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  • The Petite Pave Halo Ring in 14K white gold with 1.70-Carat Montana Sapphire, alongside the petite pave band in 14k white goldThe Petite Pave Halo Ring in 14K white gold with 1.70-Carat Montana Sapphire, alongside the petite pave band in 14k white gold

    The Petite Pave Halo Ring

    $2,600.00

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    Select optionsDone This product has multiple variants. The options may be chosen on the product page
  • The Classic Pave Halo Ring in 14k white gold features a 1.96-carat Madagascar sapphire center, surrounded by sparkling white stones, displayed on a green-striped surface.The Classic Pave Halo Ring in 14k white gold with a 1.96-carat Madagascar sapphire is displayed upright above a matching blue stone on a textured gray surface, with the "Earth's Treasury" logo at the bottom.

    The Classic Pave Halo Ring

    $2,900.00

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

    0.85-Carat Teal Blue Montana Sapphire (Heated)

    $850.00

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  • 1.00-Carat Rich Blue Montana Sapphire (Heated)

    1.00-Carat Rich Blue Montana Sapphire (Heated)

    $1,800.00

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

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

    $1,100.00

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  • A 1.19-carat Peacock Blue Montana Sapphire (Heated), square-cut, is displayed on a textured gray surface featuring the "Earth's Treasury" logo at the bottom.

    1.19-Carat Peacock Blue Montana Sapphire (Heated)

    $2,300.00

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    Add to cartDone
  • 1.44-Carat Rich Blue Montana Sapphire (Heated)

    1.44-Carat Rich Blue Montana Sapphire (Heated)

    $1,300.00

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    Add to cartDone

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.