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For Creators, Designers & Bespoke Commissions
The Raw Materials Archive
Bridging the untouched purity of raw gemstones with the architecture of high jewellery. Rivera provides ethically sourced, precision-cut materials worthy of the world’s finest creations.
RJ-EMF-01
Zambia
Zambian Emerald Faceted Strand
- Total Weight145.20 ctw
- Dimensions (mm)3.5 x 2.8 mm - 5.1 x 4.0 mm (Graduated)
- Strand Length42 cm
- TreatmentMinor Oil
RJ-EMF-02
Colombia
Colombian Emerald Faceted Beads
- Total Weight85.50 ctw
- Dimensions (mm)4.0 x 4.0 mm (Uniform)
- Strand Length38 cm
- TreatmentMinor Oil
RJ-EMS-01
Brazil
Lustrous Emerald Smooth Tumbles
- Total Weight210.00 ctw
- Dimensions (mm)6.0 x 4.5 mm - 8.5 x 6.0 mm
- Strand Length45 cm
- TreatmentModerate Oil
RJ-EMC-01
Zambia
Raw Emerald Chips
- Total Weight500.00 ctw (Parcel)
- Dimensions (mm)Various (2.0 - 5.0 mm)
- Strand LengthLoose Parcel
- TreatmentNone / Minor Oil
RJ-DMB-01
Ethically Sourced
Faceted Black Diamond Beads
- Total Weight45.00 ctw
- Dimensions (mm)2.5 x 2.5 mm
- Strand Length40 cm
- TreatmentColor Enhanced
RJ-DMB-02
Ethically Sourced
White Diamond Briolettes
- Total Weight22.50 ctw
- Dimensions (mm)3.0 x 2.0 mm
- Strand Length20 cm (Half Strand)
- TreatmentNone
Bespoke Procurement
Submit a CustomSourcing Request
When planning custom mounting, stone dimensions are more important than carat weight alone. Detail your exact specifications below, and our sourcing team will consult our global network of ethical mines and cutters.
Material Procurement Guidelines
Dimensional Variance
Natural stones may vary slightly in millimeter dimensions due to hand cutting. Strand lengths listed are approximate.
Custom Orders
Custom sourcing orders and bespoke cut stones are considered final sale once production or extraction begins.
Certification
Independent lab certification (GIA, SSEF, Gübelin) can be arranged for notable loose stones prior to mounting.