Natural Coloured Gemstones
ColourWithout Limits
Natural coloured gemstones sourced for jewellery houses, designers and professional buyers.
12 Species
Precious and fine coloured
Calibrated Sizes
Cut to millimetre specification
Matched Sets
Pairs, suites and layouts
International Supply
With export documentation
Collections
Major gemstone collections
The species we are asked for most. Each page covers colour, sizes, quality, treatment and how the stone is supplied.
SapphiresBlue, teal, pink, yellow, padparadscha-type and more
TourmalinesGreen, pink, rubellite, indicolite and bi-colour
RubiesCommercial calibrated goods through to fine singles
EmeraldsFaceted, cabochon, beads and briolettes
SpinelsRed, pink, lavender, grey and cobalt blue
Other GemstonesAquamarine, Tanzanite, Tsavorite and more
Why Global Bridge
Sourced in Bangkok. Supplied worldwide.
We source coloured gemstones to the specifications of jewellery manufacturers, designers and trade buyers — the species, colour, size and quantity the work calls for, in the format it needs.
Our office is on Mahesak Road in Bang Rak, the district where Bangkok's coloured stone trade is concentrated. A requirement can be walked around the trade rather than emailed at it, and stones can be looked at in person before anything is sent to a buyer.
- Gemstone species
- 12
- Cut and calibrated to specification
- Custom
- Trade supply
- Worldwide
Supply Formats
Supplied in the format the work needs
Tell us what your production requires. We supply around it.
Single StonesIndividual stones in any shape and size
Matched PairsFor earrings and symmetrical settings
Matched SetsConsistent size, colour and quality
Calibrated StonesPrecise dimensions for production
Parcels & LotsLots by piece or by weight
LayoutsGraduated runs assembled to a design
Rough StonesUncut, for your own cutters
Available Stones
Stock moves faster than a catalogue
Availability changes daily, so stones are shown directly — images and video of the actual stones, against your specification. Start from a species, or send the full requirement.
Emerald
- Colours
- Green, Bluish Green, Yellowish Green
- Shapes
- Emerald Cut, Oval, Cushion
- Varieties
- 3 recorded
Tourmaline
- Colours
- Green, Pink, Red
- Shapes
- Oval, Emerald Cut, Cushion
- Varieties
- 9 recorded
Source to Specification
Buying to a specification
The more precisely a requirement is stated, the faster it can be answered — and the fewer stones travel that were never going to be right.
Example requirement
- Stone Type
- Sapphire
- Colour
- Teal, medium tone
- Cut
- Emerald cut
- Dimensions
- 5 × 3 mm, calibrated
- Quantity
- 100 pieces
- Quality
- Eye clean
- Treatment
- Heated acceptable
- Delivery
- United States
Sourcing Origins
Where the coloured stone trade actually happens
Rough from mines across Africa, Asia and South America is brought to Thailand to be cut, treated and traded. These are among the producing countries behind the species buyers ask for most.
ThailandCutting, treatment and trade 
Sri LankaSapphire, spinel 
TanzaniaTanzanite, spinel 
MozambiqueRuby, tourmaline 
MadagascarSapphire, tourmaline 
BrazilTourmaline, aquamarine
A country is listed for the species commonly mined there — not as the origin of any particular stone. A stone's origin is stated only where its own record carries it.
Knowledge & Insights
Notes for professional buyers
Guidance on specification, treatment, sourcing and documentation.
Treatment
Manufacturing
Manufacturing
Get in Touch
Tell us the stone.We’ll source to the specification.
Send the species, colour, shape, size, treatment and quantity — as much of the specification as you have.