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    Loose Untreated Gemstones

    Untreated gemstones represent nature's perfect artistry, with color and clarity existing exactly as formed in the earth. Our collection features extraordinary unenhanced treasures across all varieties – each stone exhibiting its completely natural state with no human intervention, making these rare specimens particularly valued by purists and collectors seeking authentic geological masterpieces.

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    popular category imageRuby popular category imageAquamarine popular category imageSapphire popular category imageEmerald popular category imageMorganite popular category imageGarnet popular category imageDemantoid popular category imageSpinel popular category imageTanzanite popular category imageTopaz popular category imageParaiba popular category imageTourmaline popular category imageTsavorite popular category imageAmethyst
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    Gem type

    Gem type

    Color

    Color

    Shape

    Shape

    Diamond shape refers to the overall outline and facets of a diamond. It’s a crucial factor that affects a diamond’s brilliance, fire, and scintillation – its ability to reflect light and sparkle.

    LEARN MORE ABOUT Shape
    Origin

    Origin

    Treatment

    Treatment

    Carat weight

    Carat weight

    Diamond weight, also known as carat weight, is a measure of a diamond’s mass. It’s one of the four Cs (carat, cut, clarity, and color) that determine a diamond’s value and price.

    LEARN MORE ABOUT Carat weight
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    3.39 carat Cushion Shape Mozambique Ruby GRS

    3.39 Cushion Shape Mozambique Ruby GRS

    49,000.00$
    3.82 carat Sugar Loaf Tanzanian Ruby GRS

    3.82 Sugar Loaf Tanzanian Ruby GRS

    7,880.00$
    1.37 carat Oval Shape Tanzanian Ruby GRS

    1.37 Oval Shape Tanzanian Ruby GRS

    3,300.00$
    2.37 carat Pear Shape Sri Lankan Orange Sapphire

    2.37 Pear Shape Sri Lankan Orange Sapphire

    2,100.00$
    26.40 carat Cushion Shape Verdelite Afghanistanian Tourmaline

    26.40 Cushion Shape Verdelite Afghanistanian Tourmaline

    7,800.00$
    6.62 carat Pair of Radiant Shape Tanzanian Rhodolite Garnet

    6.62 Pair of Radiant Shape Tanzanian Rhodolite Garnet

    950.00$
    6.11 carat Cushion Shape Pinkish Red Tanzanian Rhodilite Garnet

    6.11 Cushion Shape Pinkish Red Tanzanian Rhodilite Garnet

    2,750.00$
    6.97 carat Oval Shape Pinkish Red Tanzanian Rhodolite Garnet

    6.97 Oval Shape Pinkish Red Tanzanian Rhodolite Garnet

    2,900.00$
    10.54 carat Pair of Pear Shape Peach Pink Brazilian Morganite

    10.54 Pair of Pear Shape Peach Pink Brazilian Morganite

    850.00$
    13.71 carat Pair of Oval Shape Pink Peach Brazilian Morganite

    13.71 Pair of Oval Shape Pink Peach Brazilian Morganite

    1,100.00$
    4.75 carat Cushion Shape Imperial Brazilian Topaz

    4.75 Cushion Shape Imperial Brazilian Topaz

    900.00$
    4.71 carat Oval Shape Brazilian Rubellite

    4.71 Oval Shape Brazilian Rubellite

    2,900.00$
    11.09 carat Oval Shape Madagascar Aquamarine

    11.09 Oval Shape Madagascar Aquamarine

    4,500.00$
    1.85 and 1.78 carat Pair of Cushion Shape Burmese Spinel

    1.85 and 1.78 Pair of Cushion Shape Burmese Spinel

    Item Upon Request
    3.50 ct Madagascar Octagonal Blue Sapphire GRS

    3.50 ct Madagascar Octagonal Blue Sapphire GRS

    Item Upon Request
    17.73 carat Oval Shape Sri Lankan Blue Sapphire

    17.73 Oval Shape Sri Lankan Blue Sapphire

    Item Upon Request
    6.59 carat Oval Shape Brazilian Imperial Topaz

    6.59 Oval Shape Brazilian Imperial Topaz

    Item Upon Request
    3.00 carat Alexandrite GRS

    3.00 Alexandrite GRS

    Item Upon Request
    1.04 carat Cushion Shape Vivid Red Mozambique Ruby

    1.04 Cushion Shape Vivid Red Mozambique Ruby

    Item Upon Request
    1.34 carat Oval Shape Vivid Red Tanzanian Ruby

    1.34 Oval Shape Vivid Red Tanzanian Ruby

    Item Upon Request
    1.95 carat Rectangular Shape Tanzanian Blue Sapphire CLG

    1.95 Rectangular Shape Tanzanian Blue Sapphire CLG

    Item Upon Request
    8.18 carat Cushion Shape Burmese Blue Sapphire SSEF

    8.18 Cushion Shape Burmese Blue Sapphire SSEF

    Item Upon Request
    5.28 carat Cushion Shape Mozambique Ruby GRS

    5.28 Cushion Shape Mozambique Ruby GRS

    Item Upon Request
    0.66 carat Oval Shape Pink Burmese Pink Spinel

    0.66 Oval Shape Pink Burmese Pink Spinel

    Item Upon Request
    3.00 and 3.31 carat Pair of Cushion Shape Burmese Mauve Spinel

    3.00 and 3.31 Pair of Cushion Shape Burmese Mauve Spinel

    Item Upon Request
    6,50 carat Cushion Shape Sri Lankan Yellow Sapphire

    6,50 Cushion Shape Sri Lankan Yellow Sapphire

    Item Upon Request
    16.53 carat Emerald Shape Sri Lankan Yellow Sapphire

    16.53 Emerald Shape Sri Lankan Yellow Sapphire

    Item Upon Request
    3.01 carat Triangle Shape Uralian Emerald AGL

    3.01 Triangle Shape Uralian Emerald AGL

    Item Upon Request
    1.49 and 1.64 carat Pair of Round Shape Uralian Demantoid

    1.49 and 1.64 Pair of Round Shape Uralian Demantoid

    Item Upon Request
    1.02 and 1.06 carat Pair of Round Shape Uralian Demantoid

    1.02 and 1.06 Pair of Round Shape Uralian Demantoid

    Item Upon Request
    1.30 and 1.34 carat Pair of Round Shape Uralian Demantoid

    1.30 and 1.34 Pair of Round Shape Uralian Demantoid

    Item Upon Request
    2.23 carat Oval Shape Uralian Demantoid AGL

    2.23 Oval Shape Uralian Demantoid AGL

    Item Upon Request
    1.01 carat Round Shape Uralian Demantoid

    1.01 Round Shape Uralian Demantoid

    Item Upon Request
    4.26 carat Pair of Round Shape Tanzanian Rhodolite Garnet

    4.26 Pair of Round Shape Tanzanian Rhodolite Garnet

    Item Upon Request
    5.15 carat Pair of Rectangular Shape Tanzanian Rhodolite Garnet

    5.15 Pair of Rectangular Shape Tanzanian Rhodolite Garnet

    Item Upon Request
    3.85 carat Emerald Shape Nigerian Spessaertite Garnet

    3.85 Emerald Shape Nigerian Spessaertite Garnet

    Item Upon Request
    13.72 carat Pair of Pear Shape Pink Peach Brazilian Morganite

    13.72 Pair of Pear Shape Pink Peach Brazilian Morganite

    Item Upon Request
    10.33 carat Oval Shape Pink Peach Brazilian Morganite

    10.33 Oval Shape Pink Peach Brazilian Morganite

    Item Upon Request
    3.64 carat Cushion Shape Blueish Grey Tanzanian Spinel

    3.64 Cushion Shape Blueish Grey Tanzanian Spinel

    Item Upon Request
    3.21 and 3.44 carat Pair of Round Uralian Demantoid AGL

    3.21 and 3.44 Pair of Round Uralian Demantoid AGL

    Item Upon Request
    3.14 carat Round Shape Uralian Demantoid AGL

    3.14 Round Shape Uralian Demantoid AGL

    Item Upon Request
    4.40 carat Pair of Pear Shape Brazilian Aquamarine

    4.40 Pair of Pear Shape Brazilian Aquamarine

    Item Upon Request
    4.42 carat Pair of Oval Shape Madagascar Aquamarines

    4.42 Pair of Oval Shape Madagascar Aquamarines

    Item Upon Request
    6.03 carat Pair of Oval Shape Brazilian Rubellites

    6.03 Pair of Oval Shape Brazilian Rubellites

    Item Upon Request
    5.58 carat Pair of Oval Shape Brazilian Rubellites

    5.58 Pair of Oval Shape Brazilian Rubellites

    Item Upon Request
    6.04 carat Oval Shape Brazilian Rubellite

    6.04 Oval Shape Brazilian Rubellite

    Item Upon Request
    4.81 carat Pair of Pear Shape Brazilian Rubellites

    4.81 Pair of Pear Shape Brazilian Rubellites

    Item Upon Request
    3.84 carat Cushion Shape Sri Lankan Blue Sapphire

    3.84 Cushion Shape Sri Lankan Blue Sapphire

    Item Upon Request

    FREQUENTLY ASKED QUESTIONS

    What price premium do untreated gemstones typically command?

    Completely natural, untreated gemstones typically command 30-100% price premiums over treated counterparts, with rare varieties like untreated sapphires sometimes selling for 300-500% more. This substantial value difference reflects both their extreme rarity and the exceptional natural formation required to achieve desirable color and clarity without enhancement. GIA-certified untreated precious stones represent the ultimate collector’s acquisition – gems exactly as nature created them.

    Why might collectors specifically seek untreated gemstones?

    Untreated gemstones represent nature’s perfect creation – possessing desirable characteristics without human intervention. Their genuine rarity continues increasing as natural rough material becomes scarcer while treatment technologies advance. For serious collectors and investors, completely natural, conflict-free gemstones offer both superior long-term value appreciation and the extraordinary satisfaction of owning something authentically perfect and unaltered.

    Which gemstone varieties are most valuable in untreated form?

    Untreated rubies and sapphires command the most extraordinary premiums, particularly those displaying exceptional color saturation without heat enhancement. Natural, unheated Paraíba tourmalines represent perhaps the ultimate colored stone investment, with prices exceeding $30,000 per carat for fine specimens. Untreated emeralds without clarity enhancement are exceedingly rare and valuable, representing less than 1% of all emeralds in the high-quality marketplace.

    We Educate

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    Bringing clarity to the realm of diamonds, gems, and fine jewelry through insight that elevates interest into true expertise.

    Color Distribution in GIA Diamond Reports: What Every Buyer Should Know
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    Color Distribution in GIA Diamond Reports: What Every Buyer Should Know

    When evaluating a fancy-color diamond, most buyers focus on the Color Grade — that familiar label ranging from Faint to Fancy Vivid. Yet there is another line on the GIA…

    ByArtem Bobrov
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    Mahenge Spinel: What Is It, What Does It Cost, and Why Every Collector Wants One
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    Mahenge Spinel: What Is It, What Does It Cost, and Why Every Collector Wants One

    So what is Mahenge spinel — and why has this single spinel gemstone rewritten the rules of the colored stone market? Mahenge spinel is a rare variety of the mineral…

    ByArtem Bobrov
    March 09, 2026

    More about Loose Gemstones

    Gemstone Quality Assessment and Authentication

    Natural gemstones derive their value from rarity, origin location, and treatment history, making professional evaluation essential for informed purchasing decisions. Precious stones from legendary sources like Kashmir sapphires or Burmese rubies command premium prices due to exceptional color saturation and clarity characteristics. Certified documentation provides authentication of natural origin and conflict-free sourcing, while gemological assessment examines inclusion patterns and optical phenomena that determine market worth.

    Read more +

    Benefits of Purchasing Loose Precious Stones

    The loose gemstones market offers collectors direct access to investment-grade specimens without the markup associated with finished jewelry. Hand-selected stones provide superior cost-per-carat value compared to traditional retail channels, allowing buyers to examine color distribution and clarity grades before custom jewelry creation. Professional cutting and artisan craftsmanship enhance natural beauty, particularly in premium collections where each loose gem receives individual attention for optimal brilliance.

    Reuven Veksler’s Premium Natural Gems Collection

    Our curated selection of loose precious stones represents museum-quality specimens sourced through sustainable practices and verified provenance from our Antwerp operations since 1974. Each natural gemstone undergoes rigorous evaluation by certified experts, ensuring collector-grade quality with traceable origins and lifetime warranty protection. From vivid sapphires to pure emeralds, our conflict-free collection offers authentic value for buyers seeking exceptional stones with superior optical characteristics and documented investment potential.

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    Frequently Asked questions

    What makes loose gemstones a better choice than pre-set stones? 

    Purchasing loose gemstones offers superior flexibility and value compared to pre-set jewelry. You can examine the stone’s natural characteristics, clarity, and color saturation without interference from settings, ensuring you’re buying genuine, high-quality specimens. Loose precious stones also allow for custom jewelry creation, where you control both the gemstone selection and design process, often resulting in better cost per carat value.

    How do you determine the worth of colored gemstones? 

    The value of colored precious stones depends on rarity, origin, natural color intensity, and clarity grade. Pure, untreated specimens from legendary sources like Burma rubies or Kashmir sapphires command premium prices due to their aesthetic appeal and investment potential. GIA certified gemstones provide documented authenticity, helping buyers understand the real market worth of their purchase.

    Are natural gemstones conflict-free and ethically sourced? 

    Our natural gemstone collection consists entirely of conflict-free specimens sourced through established networks with documented origins. Each precious stone comes with clear provenance information, ensuring ethical mining practices and responsible sourcing. This commitment to conflict-free sourcing protects both the buyer’s investment and supports sustainable gemstone trade practices.

    What's the difference between precious and semi-precious gemstones? 

    Precious stones include diamonds, rubies, sapphires, and emeralds – the traditional “big four” known for their rarity, durability, and high value. Semi-precious rocks encompass all other natural gemstones like tanzanite, garnet, or amethyst, which can still be quite rare and valuable depending on quality and origin. Both categories offer genuine beauty and investment potential when purchasing high-quality, certified specimens.

    We Educate

    View more

    Bringing clarity to the realm of diamonds, gems, and fine jewelry through insight that elevates interest into true expertise.

    Color Distribution in GIA Diamond Reports: What Every Buyer Should Know
    • Diamonds
    Color Distribution in GIA Diamond Reports: What Every Buyer Should Know

    When evaluating a fancy-color diamond, most buyers focus on the Color Grade — that familiar label ranging from Faint to Fancy Vivid. Yet there is another line on the GIA…

    ByReuven Veksler
    March 10, 2026
    Mahenge Spinel: What Is It, What Does It Cost, and Why Every Collector Wants One
    • Gemstones
    Mahenge Spinel: What Is It, What Does It Cost, and Why Every Collector Wants One

    So what is Mahenge spinel — and why has this single spinel gemstone rewritten the rules of the colored stone market? Mahenge spinel is a rare variety of the mineral…

    ByDavid Veksler
    March 09, 2026