Buyers of NYC considers eligible loose and mounted laboratory-grown diamonds for possible purchase at our Manhattan Diamond District office.
The team reviews the diamond’s documented origin, physical characteristics, report information, condition, mounting, brand or setting, and current secondary-market demand before deciding whether to present an offer. The purchase evaluation is free, and you are not required to sell.
Requesting a purchase evaluation carries zero pressure. Review the offer explanation and decide freely without obligation.
Diamonds are evaluated on documented origin (CVD/HPHT), 4Cs grading, GIA assessment, and complete-piece mounting value.
Evaluations take place securely in-person at 36 W 47th Street, Booth W07. Walk-ins welcome; appointments preferred.
When an agreement is reached, transaction records are completed immediately and payment is disbursed on the spot.
Buyers of NYC evaluates loose lab-created diamonds, mounted diamond jewelry, commercial parcels, and specialty colors. Representative items include:
For trade parcels, commercial closeouts, or quantities exceeding 10 carats, please describe total carat weight and available certificates in the intake form for specialized sorting.
Acceptance Note: Acceptance is item-specific. An item appearing in an example above is not automatically eligible for purchase. In-person physical gemological screening is required.
Bring original GIA, IGI, or GCAL reports, retail receipts, and packaging. While unreported stones may be reviewed in-person, existing documentation confirms origin (CVD/HPHT), carat weight, and quality criteria.
Do not remove stones from engagement rings or fine jewelry settings before your visit. Unsetting can damage prongs, chip stone girdles, and eliminate complete-piece jewelry value. We evaluate mounted pieces intact.
Clear disclosure and accurate gemological identification are essential. Each material represents a distinct origin, market structure, and secondary valuation route.
Optical, physical and chemical distinctions
Diamond produced through controlled manufacturing (CVD or HPHT). Shares identical optical, physical, and chemical properties with mined diamonds, but must be disclosed as manufactured.
Evaluation Focus: Documented origin, report criteria, cut, condition, and secondary demand.
Diamond formed deep within the earth over billions of years. Follows natural diamond pricing, rarity factors, and grading standards (see /sell-diamonds/).
Evaluation Focus: Separate natural diamond market benchmarks and 4Cs grading.
Different materials (silicon carbide, zirconium dioxide) that imitate the visual appearance of diamond. They are not diamond material and cannot be valued as such.
Evaluation Focus: Identified through gemological testing; not eligible for diamond purchase.
Quality Assessment criteria effective October 1, 2025
All five criteria meet GIA Premium thresholds: color, clarity, polish, symmetry, and cut (round brilliant). Applies to qualifying colorless loose lab stones ≥0.15 ct.
Service Note: Premium is a laboratory classification, not a guaranteed resale price.
Combines Premium and Standard thresholds or meets all Standard parameters under GIA’s current service. Carries assessment laser inscription.
Service Note: Evaluated under secondary market demand for stated quality specifications.
Reports issued prior to October 2025 or by recognized independent laboratories (IGI, GCAL). Format changes do not invalidate earlier documented grades.
Service Note: Document date, service type, and physical stone match are reviewed.
Lab-grown diamond valuation combines origin verification, full 4Cs gemological grading, growth method assessment (CVD/HPHT), mounting precious metal recovery, and real-time secondary market demand.
Under gemological magnification, girdle inscriptions (e.g., “LG”, report serial numbers) and specialized spectroscopic testers verify lab-grown origin and match documentation.
Carat weight is measured on calibrated digital diamond scales. For mounted stones, certified optical leveridge gauges estimate exact millimeter spread and weight.
Assessed against GIA master color sets and 10x binocular clarity grading. Chemical Vapor Deposition (CVD) and HPHT growth characteristics and post-growth treatments are evaluated.
Table percentage, crown angle, pavilion depth, symmetry, polish, and light performance (brilliance, fire, scintillation) determine cut grade desirability and market appeal.
Platinum, 18K gold, or 14K gold settings are weighed and evaluated for payable precious metal content, side accent diamonds, and designer signature value.
Offers reflect live wholesale trade pricing for lab-grown diamonds, factoring in rapid production shifts and current market supply dynamics with full transparency.
The original retail price can include design, manufacturing, store overhead, marketing, warranty, financing and retail margin. A current purchase offer reflects what a buyer can reasonably do with the item now, including current demand, condition, verification, resale route and transaction costs.
When evaluating a mounted lab-grown diamond piece, multiple value components are reviewed together rather than relying on a single element:
Evaluate each selling option based on gemological testing capability, setting valuation, speed of payment, fee deductions, and physical security.
Immediate payment upon agreement. No consignment wait times, listing commissions, or hidden deductions. Full explanation of stone quality, report criteria, and mounting value.
Diamonds evaluated in-person at our secure Manhattan Diamond District office. No mail-in risk, shipping losses, or escrow disputes. Settings valued alongside center stones.
Accessible retail locations that may offer store credit or trade-in allowances toward new jewelry purchases.
Do they purchase lab-grown diamonds outright, or only natural stones? Do they value the mounting metal, or offer zero for the setting?
Direct access to online retail consumers who may be seeking specific laboratory-grown carat sizes or ring designs.
What platform commissions (10-20%), escrow fees, return window policies, and buyer fraud risks apply during consignment?
High-volume liquidity channels for commercial melee parcels, matched pairs, and dealer closeout inventory.
Do they transact with individual consumers? What are minimum lot size thresholds, sorting requirements, and payment payment terms?
Bring the stone or jewelry with the original report and supporting documents. Photographs are preliminary only.
Provide basic information about whether the stone is loose or mounted, its shape and approximate size, report details, condition and supporting documents. Photographs are preliminary only.
Bring the stone or jewelry, the original report and any relevant packaging or receipts. Valid identification may be required if a sale is completed.
The team examines the physical item, compares it with the documentation and uses only confirmed screening or laboratory procedures.
For mounted jewelry, the team considers the stone, setting, side stones, brand, condition and complete-piece market rather than looking at one component in isolation.
If Buyers of NYC wishes to purchase the item, it may present an offer and explain the principal factors. You may accept or decline without obligation.
Bring the original laboratory report or assessment if available, and keep the item with its box and records.
Bring the original laboratory report or assessment if available.
Keep the diamond or jewelry with its box, receipt, warranty documents and service records.
Do not remove a mounted stone or replace the setting solely to obtain an evaluation.
Avoid harsh chemicals, aggressive polishing or ultrasonic cleaning when the mounting or other gemstones may be vulnerable.
Do not post a full report number, warranty-card image, address or other sensitive information publicly.
For pairs or parcels, keep the stones organized with their corresponding reports and create a simple inventory.
Ask whether the buyer confirmed origin, matched the report, and explained fees and the value route.
Did the buyer confirm that the stone is laboratory-grown?
Was the physical item matched to the report?
Were treatment and condition considered in the evaluation?
Were the setting and side stones reviewed as part of the complete piece?
Were all fees or deductions identified before the number was presented?
Is the offer for the complete item or for selected components?
A specialized evaluation team reviews eligible loose and mounted laboratory-grown diamonds at our Manhattan Diamond District office. Named credentials and testing instruments are published only when verified.
Head of Precious Metals
Head of Fine Jewelry
Head of Watches
Head of Diamonds & Precious Stones
Buyers of NYC considers eligible loose and mounted laboratory-grown diamonds. Acceptance and any offer depend on the specific stone, documentation (GIA/IGI), condition, mounting, and current secondary-market demand.
Some laboratory-grown diamonds and fine jewelry have active secondary-market demand, but there is no universal resale percentage or price guarantee. Each piece is evaluated under current wholesale market conditions.
A laboratory-grown diamond has essentially the same optical, physical, and chemical properties as a natural diamond, but it is manufactured in a laboratory rather than mined from the earth. Under FTC guidelines, it must be disclosed as laboratory-grown.
No. Moissanite (silicon carbide) and cubic zirconia (zirconium dioxide) are diamond simulants — completely different chemical materials that visually imitate diamond. They should not be confused with laboratory-grown diamonds.
CVD (Chemical Vapor Deposition) and HPHT (High Pressure, High Temperature) are the two primary manufacturing methods used to grow diamond crystal. Growth method is an identification characteristic documented on reports, not an automatic price formula.
A grading report from GIA, IGI, or GCAL facilitates verification and matching, but unreported stones may still be reviewed in-person by our gemologists using specialized screening equipment.
GIA updated its laboratory-grown assessment service on October 1, 2025. Older GIA reports with traditional 4Cs nomenclature remain valid historical records and are reviewed alongside the physical stone.
No. Premium is a laboratory quality assessment tier under GIA's current service, not a resale price promise. Current secondary market demand, shape, proportions, condition, and mounting metal still determine the purchase offer.
Yes. Mounted engagement rings, solitaires, and jewelry pieces are evaluated as complete items — including the platinum or gold setting metal, accent diamonds, designer brand, and craftsmanship.
Damaged stones may still be considered, but chips, heavy abrasions, or recutting weight loss will affect eligibility and valuation. Our gemologists inspect the stone under magnification.
Photographs assist in preliminary intake and routing, but cannot confirm origin, report matching, or condition details. A final purchase offer requires in-person physical evaluation at our Manhattan office.
No. The purchase evaluation is free with zero obligation. You are completely free to accept or decline any offer presented.
Buyers of NYC is located at 36 W 47th Street, Booth W07, New York, NY 10036, in Manhattan’s Diamond District. Current published hours are Monday – Friday: 10:00 AM – 6:00 PM. Appointments are preferred and walk-ins are welcome during published hours.
36 W 47th Street, Booth W07
New York, NY 10036
(Between 5th & 6th Avenues)
Monday – Friday: 10:00 AM – 6:00 PM
Appointments preferred; walk-ins welcome
Phone: 646-400-4553
Email: buyersofnyc1@gmail.com
For large lab-grown parcels, high-carat stones (3ct+), or multi-piece bridal sets, calling 646-400-4553 in advance reserves dedicated time with our senior gemological specialists.
Describe your loose or mounted laboratory-grown diamonds, carat weight, shape, mounting metal, and grading reports.
Origin Transparency: Laboratory-grown diamonds possess identical chemical and optical properties to mined diamonds and are evaluated based on current secondary market demand. Online submissions are preliminary and non-binding.