Front view of Lightbox Finest™ 2.5 carat round brilliant diamond
Side view of Lightbox Finest™ 2.5 carat round brilliant diamond
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    Lab-Grown Loose 2½ct. Round Brilliant Diamond

    Sale price Regular price $3,750

    Carat Weight

    Carat Weight guide

    The total weight of our products may vary, so please see the table below for more information about the carat weights we offer on stones:

     

    Round Brilliant Stones

    Carat Weight Min Carat Weight Max Carat Weight Diameter Girdle (approx. min. in mm) Diameter Girdle (approx. max. in mm)
    1/2 0.48 0.53 5.01 5.21
    3/4 0.71 0.79 5.75 5.95
    1 0.95 1.05 6.24 6.64
    1 1/2 1.40 1.50 7.06 7.46
    1 3/4 1.70 1.80 7.45 7.85
    2 1.95 2.10 7.80 8.20
    2 1/2 2.45 2.63 8.55 8.95

     

     Princess Cut Stones

    Carat Weight Min Carat Weight Max Carat Weight Length (approx. mm) Width (approx. mm)
    1/2 0.48 0.53 4.20 4.20
    5/9 0.53 0.58 4.42 4.42
    5/8 0.59 0.66 4.60 4.60
    3/4 0.71 0.79 4.92 4.92
    7/8 0.83 0.92 5.17 5.17
    1 0.95 1.05 5.41 5.41
    1 1/8 1.07 1.18 6.02 6.02
    2 2.45 2.63 7.02 7.02
    2 1/2 2.95 3.15 7.35 7.35
    3 2.95 3.15 7.85 7.85

     

    Cushion Cut Stones

    Carat Weight Min Carat Weight Max Carat Weight Length (approx. mm) Width (approx. mm)
    1/2 0.48 0.53 4.42 4.42
    5/8 0.59 0.66 4.77 4.77
    3/4 0.71 0.79 5.07 5.07
    7/8 0.83 0.92 5.34 5.34
    1 0.95 1.05 5.58 5.58
    2 1.95 2.10 7.25 7.25
    2 1/2 2.45 2.63 7.80 7.80
    3 2.95 3.15 8.35 8.35

     

    Emerald Cut Stones

    Carat Weight Min Carat Weight Max Carat Weight Length (approx. mm) Width (approx. mm)
    1 0.95 1.05 6.70 4.85
    2 1.95 2.10 8.40 6.10

     

    Oval Cut Stones

    Carat Weight Min Carat Weight Max Carat Weight Length (approx. mm) Width (approx. mm)
    1 0.95 1.05 8.03 5.73
    1 1/2 1.46 1.58 8.95 6.45
    2 1.95 2.10 9.80 7.15

     

    Asscher Cut Stones

    Carat Weight Min Carat Weight Max Carat Weight Length (approx. mm) Width (approx. mm)
    2 1.95 2.10 7.00 6.90
    2 1/2 2.45 2.63 7.52 7.42
    2.95 3.15 8.05 7.92

    Baguette Cut Stones

    Carat Weight Min Carat Weight Max Carat Weight Length (approx. mm) Width (approx. mm)
    1/4 0.24 0.26 4.30 2.90
    1/2 0.48 0.53 5.34 5.56

     

    Trillion Cut Stones

    Carat Weight Min Carat Weight Max Carat Weight Length (approx. mm) Width (approx. mm)
    1/4 0.24 0.26 4.50 4.50

     

    Heart Cut Stones

    Carat Weight Min Carat Weight Max Carat Weight Length (approx. mm) Width (approx. mm)
    1/4 0.24 0.26 4.20 4.20
     
    Color Grade
    Cut Grade

    Please note loose stones are only available to ship to select locations, see full country list here.

    Grown with 100% renewable energy

    Free shipping

    Quality guarantee

    30 day returns

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    Front view of Lightbox Finest™ 2.5 carat round brilliant diamond Front view of Lightbox Finest™ 2.5 carat round brilliant diamond
    Side view of Lightbox Finest™ 2.5 carat round brilliant diamond Side view of Lightbox Finest™ 2.5 carat round brilliant diamond

      Our quality

      Our leading technology means our lab-grown diamonds are among the finest you can find. They’re inscribed with a mark of quality invisible to the naked eye, signifying each stone has met the internationally recognized standards of the '4 C's'

      Very good cut

      VS or better clarity

      Near colorless

      Excellent cut

      VVS or better clarity

      Colorless

      The Lightbox Lab

      The Lightbox Lab

      We grow our diamonds at our Lightbox Lab in Portland, Oregon using 100% renewable wind energy.

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      Science Behind The Sparkle

      Science Behind The Sparkle

      Our cutting-edge technology can grow a one carat lab-grown diamond in about two weeks.

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