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Oval Cut Loose Diamonds
オーバルカットダイヤモンドルース
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Natural Loose Natural Diamond 0.542ct Very Light Purplish Pink Oval
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Natural Loose Natural Diamond 5.01ct M Faint Yellow VS1 Oval-cut
Regular price ¥5,500,000 (Tax incl.)Unit price per -
Sold outNatural Loose Natural Diamond 0.558ct Fancy Deep Brownish Yellow Oval
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Sold outNatural Loose Natural Diamond 1.09ct Light Green Oval
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Sold outNatural Loose Natural Diamond 3.011ct Very Light Yellow N Oval
Regular price ¥2,400,000 (Tax incl.)Unit price perSold out -
Sold outNatural Loose Natural Diamond 1.04ct Very Light Yellow N Oval
Regular price ¥400,000 (Tax incl.)Unit price perSold out -
Sold outNatural Loose Natural Diamond 0.906ct Colorless D Oval
Regular price ¥660,000 (Tax incl.)Unit price perSold out -
Sold outNatural Loose Natural Diamond 2.568ct Fancy Intense Orangy Yellow Oval
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Sold outNatural Loose Natural Diamond 10.016ct Very Light Yellow N Oval
Regular price ¥13,500,000 (Tax incl.)Unit price perSold out
How to Choose an Oval Cut Loose Diamond
Why Oval Cut for a Custom Piece
The oval cut was developed by Lazare Kaplan in the 1960s and shares the same 58-facet brilliant structure as round cut — making it one of the few fancy shapes that genuinely approaches round in terms of sparkle and light return. Its defining advantage in loose form is what the elongated shape does to perceived size: an oval diamond of the same carat weight as a round typically appears meaningfully larger, because the elongated surface distributes the stone's mass across more visible area. This makes oval cut particularly compelling for buyers who want maximum visual presence within a budget. Our oval cut loose collection spans both colorless diamonds — D through J — and fancy color stones in yellow, pink, and green, with GIA and CGL certification across the range. Buying loose allows you to assess the stone's specific bowtie effect and proportion before committing to a setting, which is especially important for oval cut where both factors vary significantly from stone to stone.
Colorless vs Fancy Color — Oval's Strengths in Both
Oval cut performs exceptionally well across both colorless and fancy color diamonds, for different reasons. For colorless ovals (D through J), the brilliant facet structure returns strong, clean light that reads as very white — particularly at higher color grades where the elongated shape shows off the stone's transparency elegantly. The finger-lengthening effect in ring settings and the large apparent face-up size make colorless oval one of the fastest-growing choices for engagement ring center stones globally. For fancy color ovals — yellow, pink, and green — the shape's elongated form concentrates and deepens color across a generous surface area, producing particularly vivid, saturated expression of the stone's hue. Yellow oval diamonds in yellow gold settings are among the most visually impactful combinations in the fancy color market. For green and pink ovals, the shape's elegant proportions lend a refinement that pairs well with both warm and cool metal settings. On proportion, a length-to-width ratio of 1.35 to 1.50 is generally considered the most balanced range for oval cut.
The Bowtie Effect — Why In-Person Viewing Matters
The bowtie effect — a dark, bowtie-shaped shadow visible across the center of elongated brilliant-cut diamonds — is inherent to oval cut and cannot be entirely eliminated. The degree to which it appears varies significantly from stone to stone and depends on facet angles and proportions that are not captured in certificate data. A stone graded identically to another on paper can appear meaningfully different in person depending on how the bowtie reads under different lighting conditions. This is the single strongest reason to view oval cut loose diamonds in person before purchasing — the bowtie is best assessed by holding the stone directly in natural light and rotating it through different angles. We strongly recommend an appointment at our Okachimachi office for any oval cut loose diamond purchase above a certain value, to ensure the stone meets your expectations before any custom work begins. Contact us to arrange a viewing.
Frequently Asked Questions
The two most important factors are the bowtie effect and the length-to-width ratio. The bowtie — a dark shadow visible across the center of the stone — varies from stone to stone and cannot be assessed from certificate data alone, making in-person viewing essential. Length-to-width ratio of 1.35 to 1.50 is generally the most balanced range. On color, colorless grades D through J all perform well in oval cut. On clarity, VS1 to VS2 is recommended for engagement ring purposes, though many SI1 stones appear eye-clean in oval cut.
The bowtie effect is a dark, bowtie-shaped shadow that appears across the center of elongated brilliant-cut diamonds like oval cut. It is inherent to the shape's structure and cannot be completely eliminated, but higher cut quality reduces its visibility. Critically, the degree of bowtie is not captured in GIA or CGL certificate data — it can only be assessed by viewing the stone directly in natural light and rotating it through different angles. This is the primary reason in-person viewing is strongly recommended for oval cut loose diamonds.
Generally yes. At the same carat weight, an oval diamond's elongated shape distributes the stone's mass across a larger visible surface area than round, making it appear meaningfully larger face-up. This is one of oval cut's most cited advantages — buyers can often get a more impressive visual presence within the same budget compared to round cut. Browse our oval cut diamond ring collection to see finished examples.
Yes. All oval cut loose diamonds at Weiss carry GIA or CGL certification, documenting color grade, clarity, carat weight, and symmetry. Note that GIA does not issue a formal cut grade for oval cut — that grade applies only to round brilliant cut. The bowtie effect is not captured in the certificate and must be assessed in person.
Yes — oval cut is one of the strongest shapes for fancy color diamonds. The elongated brilliant structure concentrates and deepens color across a generous surface area, producing particularly vivid expression of the stone's hue. Yellow oval diamonds in yellow gold settings are among the most impactful fancy color combinations available. Pink and green ovals also perform very well in both warm and cool metal settings. Browse our fancy color diamond ring collection to see finished examples.
Yes. After selecting an oval cut loose diamond, our craftsmen can create a custom ring or necklace in your preferred setting style and metal — 18K white gold, yellow gold, rose gold, or platinum. Popular settings for oval cut include four-prong and six-prong solitaires, halo designs, and pendant necklace settings. Contact us to discuss your requirements.
Yes — and for oval cut in particular we strongly recommend it. The bowtie effect can only be properly assessed in person by viewing the stone directly in natural light. Our appointment-only office is in Okachimachi, Tokyo. Please book an appointment through our contact page or by phone.
Prefer a finished piece? See our Oval cut Diamond Rings.