1.66

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  • A 1.66-carat sapphire, faceted and oval-shaped, sits on a textured gray surface with "EARTH'S TREASURY" displayed beneath.

    1.66-Carat Rich Blue Ceylon Sapphire (Heated)

    $4,100.00

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  • A square-cut, faceted 1.66-carat Ceylon Sapphire with a light purple hue is displayed on a textured, light-colored surface featuring the "EARTH'S TREASURY" logo and text below it.

    1.66-Carat Violet to Purple Color-Change Ceylon Sapphire

    $3,800.00

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  • A 1.66-carat Spessartine Garnet with orange facets sits on a textured grey surface, displaying the "EARTH'S TREASURY" logo below.

    1.66-Carat Orange Spessartine Garnet

    $900.00

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  • A 1.66-carat spessartine garnet, round brilliant-cut, is shown on a textured metallic surface with "EARTH'S TREASURY" beneath it.

    1.66-Carat Light Orange Spessartine Garnet

    $700.00

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  • A 1.66-carat heated Montana sapphire with a faceted blue surface rests on textured gray, accompanied by "EARTH'S TREASURY" text and hexagon logos below.

    1.66-Carat Teal Blue Montana Sapphire (Heated)

    $2,000.00

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    Add to cartDone
  • A 1.66-carat Tanga Garnet, faceted in a geometric cut, is displayed on a textured gray surface. The Earth's Treasury logo is visible at the bottom.

    1.66-Carat Orangey Pink Garnet

    $800.00

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  • A 1.66-carat heated Montana sapphire, deep blue and faceted, is displayed on a textured light gray surface with "EARTH'S TREASURY" at the bottom.

    1.66-Carat Rich Peacock Blue Montana Sapphire (Heated)

    $3,200.00

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  • A 1.66-carat heated Montana sapphire, round brilliant-cut and blue, is shown on a faceted gray surface with "EARTH'S TREASURY" displayed underneath.

    1.66-Carat Aqua Blue Montana Sapphire (Heated)

    $3,200.00

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    Add to cartDone
  • A 1.66-carat Montana sapphire (heated) with a round brilliant cut rests on a textured surface.

    1.66-Carat Teal Blue Montana Sapphire (Heated)

    $2,250.00

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    Add to cartDone
  • A faceted blue gemstone, the 1.66-Carat Montana Sapphire (Heated), is displayed on a textured surface, with the text "Earth's Treasury" at the bottom.

    1.66-Carat Blue-Aqua Particolored Montana Sapphire (Heated)

    $3,200.00

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    Add to cartDone
  • 1.66-Carat Violet-Blue Ceylon Sapphire

    1.66-Carat Violet-Blue Ceylon Sapphire

    $4,300.00

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    Add to cartDone
  • 1.66-Carat Deep Blue Montana Sapphire (Heated)

    1.66-Carat Deep Blue Montana Sapphire (Heated)

    $2,250.00

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    Add to cartDone
  • 1.66-Carat Medium Blue Ceylon Sapphire (Heated)

    1.66-Carat Medium Blue Ceylon Sapphire (Heated)

    $4,200.00

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    Add to cartDone
  • A 1.66-carat Peacock Blue Montana Sapphire (Heated), round brilliant-cut, rests on a textured gray surface featuring the Earth's Treasury logo and text below.

    1.66-Carat Peacock Blue Montana Sapphire (Heated)

    $4,100.00

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    Add to cartDone
  • 1.66-Carat Royal Blue Ceylon Sapphire (Heated)

    1.66-Carat Royal Blue Ceylon Sapphire (Heated)

    $4,600.00

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    Add to cartDone
  • A 1.66-carat Bright Yellow Montana Sapphire (heated, oval-cut) is shown on a textured gray surface with the "Earth's Treasury" logo beneath it.

    1.66-Carat Bright Yellow Montana Sapphire (Heated)

    $2,200.00

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    Add to cartDone
  • A 1.66-carat peacock blue Montana Sapphire (heated) with intricate faceting sits on a textured gray surface, accompanied by the "EARTH'S TREASURY" text and logo below.

    1.66-Carat Peacock Blue Montana Sapphire (Heated)

    $2,600.00

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    Add to cartDone
  • A 1.66-carat blue-teal particolored Montana Sapphire (heated), cushion-cut with intricate facets, rests on a textured gray surface above the Earth's Treasury logo.

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

    $3,750.00

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    Add to cartDone
  • A 1.66-carat violet blue-purple color change Ceylon sapphire sits on a textured surface with "EARTH'S TREASURY" below.

    1.66-Carat Violet-Blue Ceylon Sapphire

    $2,800.00

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    Add to cartDone
  • 1.66-Carat Midnight Blue Australian Sapphire (Heated)

    1.66-Carat Midnight Blue Australian Sapphire (Heated)

    $1,700.00

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    Add to cartDone
  • A gray Madagascar sapphire in our "Testudo" oval design

    1.66-Carat Near Colorless Madagascar Sapphire

    $2,500.00

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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.