Certified Laboratory-Grown Diamonds
Precision-Cut Diamonds Crafted for Brilliance
ROY DIAMOND manufactures and supplies certified laboratory-grown diamonds for jewellery manufacturers, designers, wholesalers, retailers and international B2B buyers. Wholesale buyers in Canada can request calibrated parcels or certified stones from our Surat, India team, with availability and destination requirements reviewed before order acceptance.
Production focuses on light return, balanced proportions, symmetry, polish, accurate shape outline and attractive face-up appearance. Supply includes certified solitaires, calibrated sizes, matching pairs, fancy shapes and made-to-order diamonds across buyer-specified sizes, colours, clarities and measurements.
Minimal Bow-Tie Selection
Oval, pear, marquise and other elongated fancy shapes may show a central bow-tie. Each stone is inspected face-up for actual visual performance.
- Minimal or visually acceptable bow-tie
- Even brightness and balanced facet pattern
- Reduced dark/dead areas with strong centre light return
- Attractive appearance under different lighting conditions
Final selection is based on the diamond itself, not measurements or a grading report alone.
Round Brilliant
Recommended ratio: approximately 1.00
Focus: symmetry, table/depth balance and brightness.
Oval Brilliant
Preferred ratio range: approximately 1.30–1.50
Focus: balanced outline, brilliance and minimal bow-tie.
Pear Shape
Preferred ratio range: approximately 1.50–1.75
Focus: centred point, symmetry and minimal bow-tie.
Marquise Brilliant
Preferred ratio range: approximately 1.75–2.20
Focus: aligned points, symmetry and controlled bow-tie.
Emerald Cut
Preferred ratio range: approximately 1.30–1.50
Focus: aligned steps, even corners and reduced windowing.
Radiant Cut
Square: approximately 1.00–1.10
Elongated: approximately 1.20–1.40
Focus: centre brilliance, clipped corners and minimal dark areas.
Cushion Cut
Square: approximately 1.00–1.10
Elongated: approximately 1.15–1.35
Focus: balanced outline, brilliance and reduced windowing.
Princess Cut
Preferred ratio range: approximately 1.00–1.05
Focus: symmetry, balanced chevrons and aligned corners.
Asscher Cut
Preferred ratio range: approximately 1.00–1.05
Focus: centred steps, balanced corners and reduced windowing.
Heart Shape
Preferred ratio range: approximately 0.95–1.05
Focus: defined cleft, equal lobes and centred point.
Baguette
Common ratio range: approximately 1.50–2.50
Focus: parallel sides, even steps and calibrated matching.
Tapered Baguette
Ratio and taper: manufactured according to the jewellery design
Focus: matched taper, dimensions, colour and clarity.
Trillion Cut
Preferred ratio: approximately 1.00–1.10
Focus: balanced points, symmetry and face-up brilliance.
Hexagon Cut
Common ratio range: approximately 1.00–1.20
Focus: balanced sides, centred facets and precise corners.
Kite Shape
Common ratio range: approximately 1.20–1.60
Focus: aligned points, balanced angles and controlled leakage.
Shield Cut
Common ratio range: approximately 1.20–1.50
Focus: balanced edges, symmetry and accurate matching.
Half-Moon Shape
Ratio: customised according to the centre diamond
Focus: smooth curve, straight edge and matched depth.
Bullet Cut
Common ratio range: approximately 1.50–2.00
Focus: centred point, parallel sides and reduced windowing.
Cadillac Cut
Ratio: customised according to the centre stone and jewellery design
Focus: precise angles, pair matching, colour and clarity.
Old Mine Cut
Common ratio range: approximately 1.00–1.15
Focus: balanced outline, defined flashes and controlled culet.
Antique Cushion Cut
Common ratio range: approximately 1.00–1.20
Focus: defined reflections, rounded corners and centred culet.
Our Quality Commitment
Every diamond is manufactured and selected for proportion, visual performance and practical jewellery use.
- Excellent cut and polish with balanced ratios and symmetry
- Consistent calibrated measurements and precise matching pairs
- Minimal bow-tie where applicable, with reduced windowing and dark areas
- Strict final inspection and reliable certification coordination
- In-house manufacturing control and made-to-order flexibility
- Large-scale production capability for worldwide B2B supply
Certified Quality. Precision Manufacturing. Dependable Supply.
From certified solitaires to calibrated parcels and matched fancy-shape pairs, supply is prepared for consistent professional jewellery production.
Send the required shape, carat, measurements, ratio, colour, clarity, quantity and certification preference for a customised B2B quotation.
