Square Cushion

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  • The "Augusta" ring features a 14k yellow gold band set with a 1.01-carat diamond, accented by baguette diamonds and displayed on a green stem with the Earth’s Treasury logo below.The "Augusta" ring in 14k yellow gold with a 1.01-carat diamond stands upright, highlighting its smooth band and diamond setting against a textured background, with "Earth's Treasury" at the bottom.

    The “Augusta” Ring

    $3,500.00

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  • The "Kittley" ring in platinum, featuring a 0.80-carat Montana Sapphire, is displayed on a green stem with the "Earth's Treasury" logo below.The "Kittley" ring in platinum with a 0.80-carat Montana Sapphire rests on a textured gray surface over a rough blue gemstone. "EARTH'S TREASURY" below underscores the unique jewelry and fashion elegance of this piece.

    The “Kittley” Ring

    $3,100.00

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  • The "Shannon" ring in platinum, featuring a 1.06-carat Montana sapphire and detailed Celtic knotwork, is shown on a green stem with "Earth's Treasury" beneath.The "Shannon" ring in platinum with a 1.06-carat Montana Sapphire is displayed upright, highlighting the blue rectangular stone and band against a textured metallic background. The "Earth's Treasury" logo appears below.

    The “Shannon” Ring

    $3,300.00

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  • The "Lina" ring in 14k white gold with a 2.34-carat Montana sapphire is shown on a green striped leaf, with "Earth's Treasury" text at the bottom.The "Lina" ring in 14k white gold, featuring a 2.34-carat Montana Sapphire, is displayed upright on a blue textured stone with the Earth's Treasury logo at the bottom.

    The “Lina” Solitaire

    $1,800.00

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  • The "Marcy" Ring in 14k yellow gold showcases a 1.80-carat emerald in an upright, rectangular cut, displayed against a light green background.The "Marcy" Ring in 14k yellow gold with a 1.80-carat emerald stands upright before a rough blue-green stone on textured gray. "Earth's Treasury" is printed below.

    The “Marcy” Solitaire

    $1,950.00

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  • A platinum “Winona” ring with a 1.21-carat Montana sapphire rests on a textured blue stone, displayed on a patterned surface with the text "Earth's Treasury" below.A platinum “Winona” ring with a 1.21-carat Montana sapphire rests on a textured blue stone, displayed on a patterned surface with the text "Earth's Treasury" below.

    The “Winona” Solitaire

    $2,350.00

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  • The Marlowe ring featuring a round blue gemstone in a platinum prong setting, shown on a green background with the "Earth's Treasury" logo at the bottom.The Marlowe Ring featuring a blue gemstone, stacked from 53 images using Method=B (R=14, S=2), rests on a rough blue stone atop a textured surface with the Earth's Treasury logo below.

    The “Marlowe” Solitaire

    $1,800.00

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  • The "Madi" ring in 18K yellow gold with a 1.41-carat Montana sapphire is displayed vertically on a green and silver textured surface, with "Earth's Treasury" written at the bottom.The "Madi" ring in 18K yellow gold with a 1.41-carat Montana sapphire is showcased on a rough blue-green stone, with the Earth's Treasury logo beneath on a patterned background.

    The “Madi” Solitaire

    $1,950.00

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  • The "Milan" ring in 14k yellow gold with a 1.03-carat Montana sapphire rests on a green and white surface, with The Earth's Treasury logo visible at the bottom.The "Milan" ring in 14k yellow gold with a 1.03-carat Montana sapphire stands upright before a gray stone on a textured surface, with the "Earth's Treasury" logo displayed at the bottom.

    The “Milan” Ring

    $3,100.00

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  • Displayed on a textured gray surface with the Earth's Treasury logo is a 0.91-carat, cushion-cut Montana sapphire gemstone.

    0.91-Carat Violet-Blue Montana Sapphire (Heated)

    $950.00

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  • A close-up of a cushion-cut blue Montana sapphire, weighing 1.03 carats and heated to enhance its beauty, showcasing its facets on a textured gray surface with the "Earth’s Treasury" logo at the bottom.

    1.03-Carat Peacock Blue Montana Sapphire (Heated)

    $1,500.00

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  • A 1.06-carat heated Montana sapphire with a faceted yellow hue rests on a textured surface.

    1.06-Carat Yellow-Gold Particolored Montana Sapphire (Heated)

    $1,200.00

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  • A 1.13-carat heated Montana sapphire with a cushion cut rests on a textured surface.

    1.13-Carat Rich Blue Montana Sapphire (Heated)

    $1,700.00

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  • 1.18-Carat Teal Blue Montana Sapphire (Heated)

    1.18-Carat Teal Blue Montana Sapphire (Heated)

    $2,100.00

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  • 2.19-Carat Sky Blue Ceylon Sapphire (Heated)

    2.19-Carat Sky Blue Ceylon Sapphire (Heated)

    $4,600.00

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  • The "Lillium" ring in 14k yellow gold, featuring a 1.38-carat Australian sapphire and two light blue stones, is shown on a green leaf background with the "Earth's Treasury" logo below.The "Lillium" ring in 14k yellow gold with a 1.38-carat Australian sapphire, accented by two clear stones and shown on a rough blue crystal, with the Earth's Treasury logo beneath.

    The “Lilium” Ring

    $2,600.00

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  • 0.88-Carat Aqua Blue Montana Sapphire (Heated)

    0.88-Carat Aqua Blue Montana Sapphire (Heated)

    $880.00

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  • 0.99-Carat Sky Blue Montana Sapphire (Heated)

    0.99-Carat Sky Blue Montana Sapphire (Heated)

    $1,250.00

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  • 1.08-Carat Sky-Aqua Particolored Montana Sapphire (Heated)

    1.08-Carat Sky-Aqua Particolored Montana Sapphire (Heated)

    $1,900.00

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  • A 1.13-Carat Peacock Blue Montana Sapphire (Heated), cushion-cut, sits on a textured gray surface with the "Earth's Treasury" logo and text beneath it.

    1.13-Carat Peacock Blue Montana Sapphire (Heated)

    $1,950.00

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  • 1.44-Carat Medium Blue Montana Sapphire (Heated)

    1.44-Carat Medium Blue Montana Sapphire (Heated)

    $3,200.00

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  • 1.52-Carat Teal Blue Montana Sapphire (Heated)

    1.52-Carat Teal Blue Montana Sapphire (Heated)

    $3,050.00

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  • 2.21-Carat Orange-Yellow Particolored Montana Sapphire (Heated)

    2.21-Carat Orange-Yellow Particolored Montana Sapphire (Heated)

    $2,700.00

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

    1.08-Carat Blue-Aqua Particolored 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.