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.
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.
