Refined diamond selection for jewellery professionals.
Clear specifications. Reliable sourcing. Consistent supply.
Jemstein supports jewellers, manufacturers, and bespoke jewellery projects with carefully selected diamonds matched to professional requirements for quality, certification, shape, size, colour, clarity, and availability.
Certified Natural Diamonds
Jemstein offers certified natural diamonds for jewellers, manufacturers, and bespoke jewellery projects where quality, certification, shape, and availability matter.
GIA Certified From 0.30 ct.
Large Stones 3.00 to 7.00 ct.
White Colours D to J
Fancy Colours Available on request
Cut Quality 3EX to Very Good
Clarity IF to P1
Shapes Round and other fancy cuts
Natural Melee Diamonds
Natural melee supply is focused on consistent fine jewellery production, with parcels sorted for size, colour, clarity, cut, and appearance.
Calibrated Sizes 0.8 mm to 4.0 mm
Tolerance ±0.05 mm sieve
White Colours D to H
Cut Quality 3EX to Very Good
Clarity IF to P1
Fancy ShadesAvailable on request
Unmixed Supply 100% natural
Order Flexibility No minimum order
Certified Laboratory Grown Diamonds
Jemstein supplies certified laboratory grown diamonds for modern jewellery demand, offering strong availability, consistent quality, and competitive value.
IGI Certified From 0.50 ct.
Large Stones 7.00 to 11.00 ct.
Growth Type CVD diamonds
Colours White D to G and Selected Fancy Colours: Yellow, Brown, Pink, Peach, Green, Blue
Clarity IF to VS2
Shapes Round and Fancy Cuts: Oval, Princess, Heart, Pear, Radiant, Cushion, Marquise, Emerald, Asscher, and Baguette
Custom Grown To specification
Inscription Laser inscription available on request
Custom Colour CombinationsBi-color (two-tone) laboratory-grown diamonds, available for selected projects
Laboratory Grown Melee Diamonds
Laboratory grown melee diamonds are precision-calibrated and carefully matched for clean, consistent modern jewellery production.
Calibrated Sizes 0.8 mm to 4.0 mm
Tolerance ±0.05 mm sieve
ColoursD to G range and Selected Fancy Colours
Cut Quality 3EX to Very Good
Clarity IF to VS2
Unmixed Supply 100% CVD
Order Flexibility No minimum order