Refined diamond selection for jewellery professionals.
Certified natural diamonds, calibrated melee, laboratory grown diamonds, and precision laboratory grown melee presented with a wealth-inspired palette and subtle tactile texture.
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.
A professional natural diamond selection for engagement rings, bespoke designs, fine jewellery, and selected high-value requirements.
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.
A reliable melee solution for pavé, halo designs, repeat production, calibrated parcels, and professional jewellery manufacturing.
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.
A modern CVD laboratory grown diamond range for refined jewellery collections, larger centre-stones, fancy colours, and custom-grown projects.
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.
A fully unmixed CVD melee supply for modern collections, custom designs, repeat manufacturing, and flexible 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