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    Loose 1.5 carat Gemstones

    Carat-and-half gemstones offer dramatic presence with their substantial size, creating stunning centerpieces for fine jewelry. Our collection features magnificent 1.5 ct treasures – each stone meticulously selected for exceptional quality and perfect proportions that maximize visual impact, appealing to collectors seeking impressive gems with excellent investment potential and statement-making presence.

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    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
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    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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    1.79 carat Vivid Blue Oval Shape Sri Lanka Sapphire

    1.79 Vivid Blue Oval Shape Sri Lanka Sapphire

    4,212.00$
    1.51 carat Vivid Blue Cushion Shape Sri Lanka Sapphire

    1.51 Vivid Blue Cushion Shape Sri Lanka Sapphire

    2,651.00$
    1.59 carat Vivid Blue Cushion Shape Sri Lanka Sapphire

    1.59 Vivid Blue Cushion Shape Sri Lanka Sapphire

    2,791.00$
    1.41 carat Vivid Blue Round Shape Sri Lanka Sapphire

    1.41 Vivid Blue Round Shape Sri Lanka Sapphire

    2,475.00$
    1.90 carat Blue Pear Shape Sri Lanka Sapphire

    1.90 Blue Pear Shape Sri Lanka Sapphire

    2,964.00$
    1.88 carat Vivid Blue Cushion Shape Sri Lanka Sapphire

    1.88 Vivid Blue Cushion Shape Sri Lanka Sapphire

    5,133.00$
    1.38 carat Vivid Blue Oval Shape Sri Lanka Sapphire

    1.38 Vivid Blue Oval Shape Sri Lanka Sapphire

    3,767.00$
    1.93 carat Purple Oval Shape Sri Lanka Sapphire

    1.93 Purple Oval Shape Sri Lanka Sapphire

    1,950.00$
    1.95 carat Yellow Trillion Shape Sri Lanka Sapphire

    1.95 Yellow Trillion Shape Sri Lanka Sapphire

    1,950.00$
    1.83 carat Sri Lanka Yellow Sapphire Cushion Shape

    1.83 Sri Lanka Yellow Sapphire Cushion Shape

    1,200.00$
    1.82 carat Zambia Green Emerald Round Shape

    1.82 Zambia Green Emerald Round Shape

    6,916.00$
    1.87 carat Blue Sapphire Cushion Shape GRS

    1.87 Blue Sapphire Cushion Shape GRS

    5,000.00$
    1.52 carat Pear Shape Light Blue Sapphire

    1.52 Pear Shape Light Blue Sapphire

    900.00$
    1.82 carat Oval Shape Vivid Deep Red Ruby

    1.82 Oval Shape Vivid Deep Red Ruby

    12,776.00$
    1.92 carat Octagonal Shape Intense Green Colombian Emerald ALGT

    1.92 Octagonal Shape Intense Green Colombian Emerald ALGT

    4,493.00$
    1.54 carat Pear Shape Intense Green Emerald

    1.54 Pear Shape Intense Green Emerald

    1,900.00$
    1.90 carat Emerald Shape Vivid Green Emerald

    1.90 Emerald Shape Vivid Green Emerald

    2,000.00$
    1.66 carat Octagonal Shape Deep Blue Sapphire ALGT

    1.66 Octagonal Shape Deep Blue Sapphire ALGT

    900.00$
    1.37 carat Oval Shape Tanzanian Ruby GRS

    1.37 Oval Shape Tanzanian Ruby GRS

    3,300.00$
    1.87 carat Colombian Green Emerald Octagon Shape

    1.87 Colombian Green Emerald Octagon Shape

    Item Upon Request
    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
    1.61 carat Octagonal Shape Deep Blue Sapphire ALGT

    1.61 Octagonal Shape Deep Blue Sapphire ALGT

    Item Upon Request
    1.69 carat Oval Shape Deep Blue Sapphire ALGT

    1.69 Oval Shape Deep Blue Sapphire ALGT

    Item Upon Request
    1.69 and 1.77 carat Pair of Green Emerald Shape Zambian Emerald

    1.69 and 1.77 Pair of Green Emerald Shape Zambian Emerald

    Item Upon Request
    1.95 carat Rectangular Shape Tanzanian Blue Sapphire CLG

    1.95 Rectangular Shape Tanzanian Blue Sapphire CLG

    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
    1.30 and 1.34 carat Pair of Round Shape Uralian Demantoid

    1.30 and 1.34 Pair of Round Shape Uralian Demantoid

    Item Upon Request

    FREQUENTLY ASKED QUESTIONS

    Why do 1.5 carat gemstones offer exceptional presence in fine jewelry?

    At 1.5 carats, gemstones achieve substantial visual impact while maintaining elegant proportions suitable for sophisticated jewelry designs. Their considerable size creates undeniable presence without the potential ostentation of larger stones, striking perfect balance between significance and tasteful elegance. Natural precious stones of this size command attention without overwhelming, making them ideal centerpieces for important jewelry intended to impress without appearing excessive.

    How does the price-per-carat change at the 1.5 carat threshold?

    Gemstones weighing exactly 1.5 carats typically command 15-25% price premiums per carat over similar-quality one-carat stones, reflecting both their increased rarity and substantial visual advantage. This value inflection point makes high-quality, GIA-certified stones in this weight category particularly desirable for collectors understanding value dynamics. For investment-grade precious stones, this size represents an excellent balance between the liquidity of benchmark weights and the exclusivity of larger sizes.

    Which gemstone varieties are particularly impressive at 1.5 carats?

    Emeralds display exceptional character at this size, large enough to showcase their unique “jardin” inclusions while achieving impressive presence. Sapphires and rubies reach optimal color saturation without becoming overly dark, displaying their finest characteristics. For rare collectible stones like alexandrite or Paraíba tourmaline, the 1.5 carat size represents a significant milestone where the stone’s distinctive properties become truly impressive while remaining more accessible than larger specimens.

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    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.

    White Diamond Color Grading Scale: The Complete Guide to D-Z Colors
    • Diamonds
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    Understanding diamond color is essential when evaluating and purchasing white diamonds. The Gemological Institute of America (GIA) created the universally recognized D-to-Z color grading scale to provide consistent standards for…

    ByReuven Veksler
    February 04, 2026
    What to Do in Antwerp: Culture, Cuisine, and Diamonds
    • Lifestyle
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