Diamond Supply for Independent Jewellery Brands

An independent jewellery brand needs more than access to a large diamond inventory. It needs a supplier that can work from written specifications, confirm realistic quantities and lead times, maintain agreed quality across repeat orders, provide appropriate sourcing and grading documentation, communicate changes promptly and deliver under clear inspection and return terms.

Before placing a production order, define the diamond type, quantity, size tolerance, colour and clarity range, matching standard, documentation, price basis, delivery date and substitution rules. Begin with a sample or pilot order when the relationship or product specification is new.

Start With the Brand’s Production Model

The right supply structure depends on how the brand sells and manufactures.

Common models include:

Made to order

Diamonds are sourced after a customer places an order.

This can reduce inventory exposure, but the brand needs:

• Realistic sourcing lead times
• Clear customer communication
• Defined substitution rules
• A process for approving the individual diamond

Small-batch production

A limited quantity of diamonds is ordered for a controlled production run.

The priority is consistency within that batch and clarity about whether the specification can be replenished.

Core-stock production

The brand holds diamonds for proven designs that sell repeatedly.

This model requires:

• Reorder points
• Stock monitoring
• Replenishment lead times
• Agreed repeat-quality tolerances

Bespoke sourcing

One or more diamonds are sourced for a particular client or commission.

The supplier needs a detailed customer brief, while the brand needs clear reservation, viewing, return and approval terms.

A brand can use more than one model. The purchasing process should identify which model applies to every order.

Define Quantities Precisely

“Small order” is not a useful purchasing specification.

State whether the requirement is:

• One centre diamond
• One matched pair
• A specified number of individual stones
• A parcel with a total carat weight
• A quantity per jewellery piece
• A complete production-run quantity
• A replenishment order
• An estimated annual volume

For example:

Incorrect: “We need small Round diamonds for a collection.”

Better: “We need 240 natural Round diamonds, 1.30–1.35 mm, G–H colour range, VS–SI clarity range, visually matched, divided into 20 labelled production sets of 12 stones.”

The quantities and specifications above are illustrative—not a recommendation or Dalila quotation.

Ask About Minimum-Order Requirements

There is no universal minimum order across diamond suppliers or product categories.

Ask whether the minimum is based on:

• Number of stones
• Total carat weight
• Parcel size
• Monetary value
• One specification
• Mixed specifications
• One report-bearing centre stone
• A production programme
• Repeat-order commitment

Also ask:

• Can different sizes be combined?
• Can centre stones and melee be placed on one order?
• Is there a minimum for custom sorting?
• Is sampling charged separately?
• Does the minimum change for matched pairs?
• Does replenishment have the same minimum as the first order?

Do not publish a minimum order on the website unless it is a genuine current policy.

Create a Written Diamond Specification

Every repeatable design should have a controlled diamond specification.

The specification should include:

Avoid using subjective terms such as:

• Premium
• Beautiful
• High quality
• White
• Eye clean
• Perfectly matched
• Ideal size

These expressions require measurable definitions.

For example, “eye clean” should state the viewing distance, lighting, angle and whether the standard applies face-up only.

Use Millimetres for Production Diamonds

Carat weight is not enough when diamonds must fit repeat settings.

For calibrated stones, specify:

• Nominal diameter or dimensions
• Permitted positive and negative tolerance
• Shape
• Depth limits where necessary
• Quantity
• Matching range
• Whether the stones must fit an existing CAD or master setting

A CAD design built for 1.30 mm diamonds may not perform consistently if delivered stones vary widely in diameter or depth.

Variation can affect:

• Seat preparation
• Setting speed
• Metal coverage
• Prong alignment
• Stone height
• Finished symmetry
• Repair and replacement work

The Calibrated Diamonds Wholesale Guide owns the detailed guidance on calibrated sizes, parcels and production tolerances.

Define Visual Consistency

Two diamonds can sit within the same colour and clarity range without looking identical.

A brand may also need consistency in:

• Outline
• Length-to-width ratio
• Facet pattern
• Brightness
• Fluorescence
• Inclusion visibility
• Shade
• Milky or hazy appearance
• Girdle appearance
• Overall visual character

For repeated jewellery, agree whether matching applies:

• Within each piece
• Within each pair
• Within one production batch
• Across all future replenishment
• Only within stated grading tolerances

Natural diamonds are individual stones. A supplier should not promise indefinite visual identity unless a practical matching standard and supply plan support it.

Approve a Sample or Master Standard

Before a new production run, consider approving:

• A sample parcel
• A matched pair
• A finished prototype
• A photographed reference set
• A written master specification

The approval record should state:

• What was approved
• By whom
• On what date
• Which tolerances apply
• Which characteristics may vary
• Whether the sample must be returned
• Whether future orders will match the sample or only the written specification

A physical sample alone can create disputes if the acceptable tolerances are not documented.

Plan for Replenishment Before Launch

A collection is not operationally repeatable merely because the first order was successful.

Before launch, ask:

• Is this specification regularly available?
• What is the normal replenishment lead time?
• Which grades or sizes are most likely to vary?
• Can the supplier reserve recurring production?
• What happens if one grade becomes unavailable?
• Is written approval required before substitution?
• Can replacements be matched to previous batches?
• How long are reports, images and order records retained?

Create an agreed fallback hierarchy.

For example:

1. Supply the original approved specification.
2. If unavailable, notify the brand.
3. Provide clearly identified alternatives.
4. Explain every difference.
5. Obtain written approval.
6. Update the purchase order before dispatch.

A supplier must never make an undisclosed substitution.

Handle Centre Stones Separately

Individually significant centre stones may require a different process from melee.

For a centre diamond, confirm:

• Stock number
• Laboratory
• Report number
• Shape
• Carat
• Colour
• Clarity
• Cut grade where applicable
• Polish
• Symmetry
• Fluorescence
• Measurements
• Treatments
• Images or video
• Availability
• Reservation expiry
• Return terms

Verify the report through the issuing laboratory and match the diamond with the report.

The Diamond Grading Report Guide explains the broader verification process.

Keep Product Identity Clear

Every quotation, order acknowledgement, invoice and product record should clearly identify whether the diamonds are:

• Natural
• Laboratory-grown
• Treated
• Untreated where confirmed
• Another disclosed product category

Do not allow different categories to be mixed under vague descriptions such as “diamond parcel.”

The supplier’s documentation should match the brand’s:

• Product page
• Packaging
• Customer invoice
• Stock record
• Care information
• Marketing claims

Request Sourcing Documentation That Matches the Claim

A standard grading report does not automatically establish mining origin or complete supply-chain provenance.

If the brand intends to make a sourcing claim, define exactly what the claim means and request evidence that supports it.

Useful records can include:

• Supplier invoice
• Seller identity
• Stock or parcel references
• Laboratory reports
• Treatment disclosure
• Origin documents where specifically available
• Import or compliance records where applicable
• World Diamond Council System of Warranties statement
• Records supporting any branded sourcing programme

The World Diamond Council explains that its System of Warranties uses a warranty statement on B2B invoices or memos as diamonds move through the trade. See the current WDC System of Warranties.

A WDC warranty statement is one due-diligence record. It should not be described as proof of a specific mine or complete traceability unless additional evidence supports that claim.

The OECD describes due diligence as an ongoing, risk-based process rather than a single certificate. See the OECD guidance for responsible business conduct.

Request a Complete Written Quotation

A usable quotation should identify:

• Supplier’s legal entity
• Brand’s legal entity
• Quotation date
• Quotation-validity period
• Product identity
• Quantity
• Specifications
• Stock or report numbers
• Unit or price-per-carat basis
• Total price
• Currency
• Taxes
• Shipping
• Insurance
• Payment terms
• Reservation terms
• Estimated dispatch date
• Delivery destination
• Inspection period
• Return conditions
• Approved substitutions
• Risk-transfer point

Do not compare quotations using only the headline diamond rate.

For a broader pricing explanation, use Diamond Wholesale Pricing Explained.

Define the Lead Time Properly

“Delivery in two weeks” can mean different things.

Separate the timeline into:

1. Specification confirmation
2. Sourcing
3. Sample approval
4. Sorting or matching
5. Laboratory-report retrieval
6. Order confirmation
7. Payment
8. Quality control
9. Dispatch
10. Transit
11. Customs where applicable
12. Receipt and inspection

Ask whether the quoted lead time begins:

• When the enquiry is received
• When specifications are approved
• When payment is received
• When the stones are reserved
• When the purchase order is accepted

The supplier should distinguish between:

• In-stock
• Supplier-held
• Subject to prior sale
• On memo
• To be sourced
• To be graded
• Made or sorted to order

Do not promise a customer delivery date until the relevant diamond availability and production schedule have been confirmed.

Set a Communication Process

Good supply depends on structured communication, not message volume.

Agree:

• Primary commercial contact
• Production or quality contact
• Finance contact
• Shipping contact
• Normal response expectations
• Urgent-order channel
• Document format
• Approval authority
• Escalation route

Every material change should be recorded in writing.

This includes changes to:

• Quantity
• Size
• Colour
• Clarity
• Price
• Currency
• Report
• Availability
• Delivery date
• Packaging
• Shipping
• Substitution

Informal messages should not override the approved purchase order without documented confirmation.

Require an Order Acknowledgement

After placing an order, obtain written acknowledgement showing:

• Purchase-order reference
• Final specifications
• Confirmed quantities
• Confirmed prices
• Payment status
• Availability status
• Approved delivery date
• Shipping responsibility
• Insurance responsibility
• Inspection and return terms

For reported centre stones, include the stock and report number.

For production parcels, include the size and quality ranges, total quantity or weight and packaging instructions.

Define Packaging and Labelling

Packaging should help production teams identify diamonds without re-sorting the complete shipment.

Depending on the order, request labels for:

• Purchase order
• Design or SKU
• Diamond size
• Colour range
• Clarity range
• Piece count
• Total carat weight
• Pair or set
• Stock number
• Report number
• Production batch

Keep report-bearing centre stones separate from unreported production parcels.

If matched stones belong together, the packaging and invoice should preserve that relationship.

Confirm Shipping, Insurance and Risk Transfer

Before dispatch, agree:

• Carrier
• Service level
• Declared value
• Insurance responsibility
• Approved delivery address
• Required signature
• Packaging
• Customs documentation
• Tracking process
• Risk-transfer point
• Procedure for delay, loss or visible damage

Do not assume that shipping is insured merely because it is tracked.

The purchase order or supplier agreement should identify who carries the risk at each stage.

Create an Incoming Quality-Control Process

Inspect the delivery before releasing diamonds to production.

Check:

• Package condition
• Quantity
• Total weight where applicable
• Product category
• Size and tolerance
• Colour range
• Clarity range
• Shape
• Matching
• Treatments
• Reports
• Report numbers
• Stock numbers
• Images or approved samples
• Invoice accuracy
• Visible damage

Keep the goods separate from production until acceptance is complete.

Record the inspection date and the person responsible.

Agree on Discrepancy and Return Procedures

Before ordering, define what happens when:

• Quantity is short
• Size tolerance is missed
• Colour or clarity falls outside the specification
• Matching is inconsistent
• A report does not match
• A diamond is damaged
• The wrong product category is delivered
• Documentation is incomplete
• Delivery is late
• An unauthorised substitution is made

The agreement should state:

• Inspection period
• Evidence required
• Return-authorisation process
• Return shipping responsibility
• Insurance responsibility
• Refund or replacement process
• Credit-note timing
• Treatment of partially used parcels
• Treatment of custom-sorted goods

Do not begin setting disputed stones before the discrepancy is documented and resolved.

Start With a Pilot Order

A pilot order can test:

• Specification interpretation
• Sorting consistency
• Packaging
• Documentation
• Communication
• Lead time
• Shipping
• Invoice accuracy
• Discrepancy handling

The pilot should be commercially meaningful but limited enough to review safely.

A successful sample does not eliminate the need for written standards. It provides evidence that both parties understand those standards.

Measure Supplier Performance

Independent brands should review suppliers using consistent records.

Possible measures include:

Review performance quarterly or every six months, depending on order frequency.

A long relationship should improve predictability, but past performance does not remove the need to inspect new orders.

Example Independent-Brand Supply Brief

Product: Natural diamond pavé band Production quantity: 20 rings Diamonds per ring: 18 Total required quantity: 360 stones plus an agreed replacement allowance Shape: Round Nominal size: 1.30 mm Tolerance: To be confirmed in writing Colour: G–H Clarity: VS–SI Matching: Consistent within each ring and across the production batch Treatment: No undisclosed treatment Documentation: Invoice, batch reference and required sourcing statement Packaging: 20 labelled production sets plus replacements Sample: One set for approval before full sorting Substitution: Written approval required Delivery: Confirmed dispatch and arrival milestones Inspection: Written inspection period Returns: Agreed process for out-of-specification stones

This is an illustrative brief, not a universal quality recommendation or live Dalila offer.

Supplier-Relationship Checklist

Before approving an ongoing supply arrangement, confirm:

• Legal supplier identity verified
• Brand production model explained
• Product category defined
• Quantities defined
• Minimum orders confirmed
• Size tolerances documented
• Colour and clarity ranges documented
• Cut and finish requirements documented
• Matching standard documented
• Treatment disclosure required
• Report requirements defined
• Sample or pilot order approved
• Replenishment tolerances defined
• Substitution process defined
• Sourcing claims matched with evidence
• Written quotation received
• Price basis and currency confirmed
• Taxes and landed costs considered
• Lead-time stages confirmed
• Order acknowledgement received
• Packaging and labelling defined
• Shipping responsibility confirmed
• Insurance responsibility confirmed
• Risk-transfer point confirmed
• Inspection window agreed
• Return process agreed
• Discrepancy process agreed
• Communication contacts assigned
• Supplier performance recorded

Frequently Asked Questions

Build the Supply System Before Scaling the Collection

The best supplier relationship for an independent jewellery brand is measurable and repeatable. Define the requirement, approve the sample, document the commercial terms, inspect the delivery and record performance.

A large inventory is useful only when the supplier can convert it into the correct stones, quantities, documents and delivery for the brand’s production schedule.

Browse Dalila Diamonds’ current inventory or contact the team with a written supply brief.

Inventory, minimum quantities, pricing, sourcing documentation and lead times depend on the individual requirement. Confirm all details in writing before accepting a quotation or promising a customer delivery date.