Bulk Loose Lab Grown Diamonds — The Complete Wholesale Buying Guide

Before placing any bulk order, understanding the current wholesale market environment gives you critical context for making pricing decisions intelligently and negotiating supply terms effectively.

Lab grown diamond wholesale prices fell 9% in Q3 2025 from Q2 2025 — and year on year, wholesale prices declined 37% compared to the same period in 2024. The most significant price declines were recorded in 3-carat rounds, which fell 43% year on year. For bulk buyers, this market environment is extraordinarily favourable — prices have stabilised at levels that allow jewelers to build inventory at the lowest real-terms cost in the history of the lab grown diamond market, while maintaining strong retail margins.

The average retail cost for a round, 1-carat, IGI-certified lab grown diamond was $191 per carat in Q2 2025 — approximately double the wholesale market trading price. US jewelry dealers have high markups on their lab grown diamond costs, resulting in an average gross margin of 74% for 1–3 carat rounds — up nearly 8% year on year. Read that again: an average gross margin of 74% on every lab grown diamond sold in the 1–3 carat range. This is not a niche margin available only to the most aggressive operators — it is the market average. Jewelers sourcing at the wholesale level and selling at retail prices are operating in one of the highest-margin product categories in all of fine jewelry retail.

In Q2 2025, US retailers paid $225 for a 2-carat lab diamond — more than double the wholesale market trading price. With the cost reduction, US jewelry retailers had a decline of about 30% in their expenditure on loose lab grown diamonds year on year, while the value of their inventory declined with it. This dynamic — lower wholesale cost, stable retail demand, expanding gross margins — defines the current opportunity for bulk buyers who source intelligently.

The average trading wholesale price of 1–3 carat round-shaped lab grown diamonds decreased by 8.9% from Q4 2024 according to the LGD Wholesale Price List for Q1 2025. In March, the average wholesale price difference between a 1-carat and a 2-carat lab grown diamond was approximately 10% — representing significant price compression between sizes. This price compression is a particularly important signal for bulk buyers: the traditional premium for larger stones at the wholesale level is narrowing, making 2-carat and 3-carat bulk purchases increasingly attractive in value terms relative to 1-carat goods.

The message for bulk buyers in 2025 and 2026 is clear. Wholesale prices have stabilised after several years of rapid decline. Gross margins at retail are at their highest levels in years. And the market has matured to the point where quality and certification — not simply price per carat — are the primary differentiators between suppliers. This is the ideal environment in which to establish a bulk supply relationship with a certified Antwerp manufacturer.

A loose lab grown diamond is a finished, cut, and polished lab grown diamond that has not yet been set into a piece of jewelry. It is graded and certified as an individual stone — with its own grading report from GIA, IGI, or HRD confirming its Cut, Colour, Clarity, and Carat weight — and is ready to be set into any mounting, ring, pendant, earring, or bracelet design.

Loose lab grown diamonds are the foundation of the wholesale diamond market. Jewelers, jewelry manufacturers, and designers source loose stones and set them into their own designs — either made in-house or commissioned from a manufacturer. This gives the jeweler complete control over the final product design, the setting specification, and the presentation to the end customer.

Buying loose lab grown diamonds in bulk — rather than purchasing individually or in small quantities — creates several commercial advantages that compound significantly over the course of a full trading year.

• Lower cost per stone. Bulk purchasing directly from a manufacturer eliminates multiple margin layers from the supply chain. The more stones you purchase in a single order or over a structured supply relationship, the better the pricing available to you from a direct manufacturer who values the consistency of your business.
• Supply certainty. A bulk supply relationship with an established manufacturer means your inventory pipeline is predictable. You know what you have coming, when it arrives, and at what price — allowing you to plan production schedules, marketing campaigns, and retail pricing with confidence rather than uncertainty.
• Consistency across matched parcels. For jewelry manufacturers producing multi-stone pieces — tennis bracelets, eternity rings, pavé bands, multi-stone earrings — bulk sourcing from a single manufacturer gives you consistent colour, clarity, and cut grades across the entire parcel. Sourcing individual stones from multiple sources creates grade inconsistency that is visible in the finished piece and problematic for quality-conscious retail customers.
• Stronger negotiating position. A buyer who commits to bulk purchasing volume has a materially stronger negotiating position with a wholesale supplier than a spot buyer purchasing individual stones. Volume commitments create the foundation for long-term pricing agreements, priority allocation on high-demand specifications, and first access to new inventory.

For bulk buyers in 2025 and 2026, the distinction between CVD and HPHT lab grown diamonds has taken on renewed commercial importance — because current market dynamics have created a pricing anomaly that affects bulk purchasing decisions directly.

HPHT technology is now the source of the majority of lab grown diamonds weighing up to 1.50 carats. HPHT is a much lower cost process that results in higher colour lab grown diamonds. The outcome is a current anomaly in the market where 1-carat HPHT D VVS rounds are trading below the prices of lower colour and clarity goods. Most retailers do not check if the loose lab grown diamonds they procure are HPHT or CVD — although they could save on their costs.

This is a significant piece of market intelligence for bulk buyers. Here is what it means in practice:

Chemical Vapor Deposition (CVD)

CVD is the process by which a diamond seed is placed in a sealed chamber filled with carbon-rich gas. The gas is ionised into plasma, causing carbon atoms to deposit layer by layer onto the seed — growing a diamond crystal over a period of weeks. CVD is predominantly used for larger stones (2 carats and above), and is the primary method used in Indian manufacturing facilities. CVD diamonds are valued for their optical purity and their ability to grow very large, high-clarity stones. The bulk of lab grown diamonds weighing two carats or more are CVD.

High-Pressure High-Temperature (HPHT)

HPHT replicates the geological conditions under which natural diamonds form — applying extreme pressure and temperature to a carbon source to grow a diamond crystal. HPHT is predominantly produced in China and is a lower-cost process. HPHT-created goods are trading at a discount compared to CVD-made lab grown diamonds. For bulk buyers sourcing in the under-1.5-carat range, HPHT goods currently offer exceptional value — particularly in higher colour and clarity grades where the current market anomaly has pushed HPHT D/VVS pricing below equivalent CVD goods.

At Uniglo Diamonds, we supply both CVD and HPHT certified loose lab grown diamonds — and our team provides specific guidance on which method best serves your particular bulk purchasing requirements. For buyers sourcing primarily in the under-1.5-carat range, understanding the current HPHT market dynamic can translate into meaningful cost advantages on bulk orders. For buyers sourcing 2-carat and above, CVD remains the dominant and most widely available option.

Understanding current wholesale pricing ranges helps bulk buyers evaluate supplier quotes accurately and build realistic margin models.

A 1-carat lab grown diamond in 2025 costs around $1,200 to $3,000 at retail — far cheaper than a mined equivalent that often starts at $4,000 and can reach $8,000 for matching specifications. At the wholesale level, pricing is significantly lower — and for bulk buyers sourcing directly from a manufacturer, pricing is lower still.

Current Retail Price Reference Ranges by Carat and Grade (2025–2026):

0.5 ct: Low Range (SI1, J, Good) ~$300–$500 | Mid Range (VS2, G-H, VG) ~$500–$800 | High Range (VVS1, D-F, Ideal) ~$900–$1,300

1.0 ct: Low Range (SI1, J, Good) ~$1,200–$1,600 | Mid Range (VS2, G-H, VG) ~$1,600–$2,300 | High Range (VVS1, D-F, Ideal) ~$2,400–$3,000

1.5 ct: Low Range (SI1, J, Good) ~$1,800–$2,500 | Mid Range (VS2, G-H, VG) ~$2,500–$3,800 | High Range (VVS1, D-F, Ideal) ~$4,000–$5,500

2.0 ct: Low Range (SI1, J, Good) ~$4,000–$5,500 | Mid Range (VS2, G-H, VG) ~$5,500–$7,000 | High Range (VVS1, D-F, Ideal) ~$7,500–$10,000

3.0 ct: Low Range (SI1, J, Good) ~$6,000–$8,000 | Mid Range (VS2, G-H, VG) ~$8,000–$12,000 | High Range (VVS1, D-F, Ideal) ~$13,000–$18,000

Retail reference ranges only. Wholesale and bulk pricing available directly from Uniglo Diamonds — contact our wholesale team for current pricing on your specific requirements.

The top-selling lab grown diamond in Q2 2025 was a 2.23-carat, round, E/VS1 — accounting for more than 20% of lab grown diamond sales, selling on average for $917 per carat at a gross margin of 74%. This data point is extremely useful for bulk buyers building inventory strategy. The 2-carat E/VS1 specification is not the cheapest stone available — it is a premium specification at a premium price point. The fact that it was the top-selling item in the market confirms that consumer demand is concentrated at the higher-quality end of the lab grown spectrum, not at the lowest price point. Bulk buyers who build inventory around quality, certified premium specifications — rather than chasing the cheapest per-carat price — are aligning their purchasing with actual market demand.

The shape of a loose lab grown diamond is one of the most commercially important variables for bulk buyers — because different shapes serve different jewelry categories, different customer demographics, and different price points.

Round Brilliant — The Commercial Foundation

Round brilliant is the dominant shape in the global lab grown diamond market — commanding the largest share of engagement ring sales and the broadest appeal across all jewelry categories. Round-shaped lab grown wholesale prices were down 2% versus Q2 2025 — with two-carat stones, VS rounds, and one-carat ovals among the few categories that saw prices firm up in the last couple of months of Q3 2025. For bulk buyers, round brilliant inventory is the commercial core of any lab grown diamond purchasing strategy. Deep, well-graded round brilliant stock in the 1–3 carat range covers the majority of retail jewelry demand across engagement rings, solitaire pendants, and stud earrings.

Oval — The Fastest Growing Shape

Oval has emerged as the second most commercially important shape for lab grown diamonds — driven by its elongating visual effect on the finger and its strong appeal among millennial buyers seeking a distinctive alternative to the classic round. Oval pricing has shown relative resilience in the current market — one-carat ovals were among the few categories that saw wholesale prices firm up in the last couple of months of Q3 2025. For bulk buyers, oval represents a high-margin opportunity precisely because demand is growing faster than supply in this shape category.

Cushion, Pear, and Emerald — High-Value Fashion Shapes

Cushion cut has long been a strong commercial performer — particularly in halo engagement ring settings. Pear has grown significantly in popularity for engagement rings over the past three years. Emerald cut commands a strong premium for its sophisticated, architectural appearance and its appeal to design-conscious buyers. All three shapes are important components of a well-rounded bulk loose diamond inventory.

Princess, Asscher, Marquise, Radiant, and Heart

These shapes serve specific design applications and customer requests. While they represent smaller portions of overall sales volume, jewelers who carry certified inventory in these shapes are able to serve customer requests that competitors without this inventory cannot fulfil — a meaningful competitive advantage in retail contexts where the customer has already decided on a specific shape preference.

At Uniglo Diamonds, we maintain certified bulk inventory across all major shapes. Custom cutting requirements — specific shape variations or branded cuts — can be accommodated through our Antwerp manufacturing facility.

For jewelers and retailers establishing a bulk supply relationship for the first time, understanding the process removes uncertainty and allows you to move quickly from initial inquiry to active supply relationship.

Step 1: Define Your Specification Requirements

Before contacting any supplier, define clearly what your business needs from a bulk order. This means specifying: the shapes you need (round brilliant, oval, cushion, etc.), the carat weight ranges most relevant to your retail price points, the colour and clarity grades that match your product positioning, the certification standard you require (GIA, IGI, or HRD), and an approximate quantity or value range for the order.

The more specific you are in your initial inquiry, the faster and more accurately a professional wholesale supplier can respond with relevant pricing and availability.

Step 2: Contact a Direct Manufacturer — Not a Platform

For bulk purchases, a direct manufacturer relationship is strongly preferable to purchasing through a trading platform or broker. A manufacturer can provide: consistent supply across multiple orders at agreed pricing, custom specification fulfilment for shapes or grades not available from platform inventory, matched parcels for multi-stone jewelry manufacturing, and direct quality accountability on every stone in every order.

Contact Uniglo Diamonds directly at suraj@uniglodiamonds.com or +32 03 500 91 07 with your specification requirements and we will provide current wholesale pricing, confirm availability, and discuss supply terms suited to your business.

Step 3: Request Grading Reports Before Confirming Any Order

Every stone in a bulk order should have a current grading report from GIA, IGI, or HRD. Before confirming any bulk purchase, request to see the grading reports for the specific stones you are ordering — either the actual certificates or the certificate numbers for independent verification on the grading laboratory's website. A credible wholesale supplier will provide this without hesitation.

Step 4: Arrange a Showroom Visit for First-Time Bulk Orders

For significant bulk purchases, visiting the supplier's facility and viewing the stones in person is the most reliable quality assurance step available. Uniglo Diamonds welcomes wholesale buyers to our Antwerp showroom at Hoveniersstraat 30, where you can inspect any stone under proper gemological lighting and magnification against its grading certificate. Contact us to arrange a visit by appointment.

Step 5: Confirm Supply Terms in Writing

Before any bulk order is placed, confirm in writing: the specification of each stone, the certificate number for each stone, the agreed price per stone or per carat, payment terms, delivery timeline, insurance coverage for shipment, and the process for raising quality concerns post-delivery. Professional wholesale suppliers document all of these terms as a matter of standard practice.

Uniglo Diamonds is a direct manufacturer and wholesale supplier of certified loose lab grown diamonds, based at Hoveniersstraat 30 in Antwerp's diamond district. Here is specifically what we offer bulk buyers that distinguishes our supply relationship from every alternative.

• Direct manufacturer pricing. Because we manufacture in our own Antwerp facility, bulk buyers access manufacturer-level pricing — the lowest price tier in the supply chain — without any broker, distributor, or platform markup between us and your purchase order. Both wholesalers and retailers have remarkably high gross margins on lab grown diamond wholesale prices. US jewelry dealers have high markups on their lab grown diamond costs, resulting in an average gross margin of 74% for 1–3 carat rounds. Sourcing directly from a manufacturer like Uniglo Diamonds positions your business at the most advantageous point in the supply chain to capture these margins fully.
• Tri-certification: GIA, IGI, and HRD. Every bulk order can be specified with certification from any of the three globally recognised grading authorities. For European buyers, IGI certified loose lab grown diamonds are the most widely used and commercially accepted standard. For premium market segments, GIA certification is available. For European trade buyers who value HRD's Antwerp provenance, HRD certification is available. This flexibility across certification standards is a significant practical advantage for bulk buyers serving diverse markets.
• Matched parcel capability. For jewelry manufacturers producing multi-stone pieces, Uniglo Diamonds supplies precision-matched parcels — consistent colour, clarity, and cut grades across the entire set. This is a manufacturing-level capability that requires the kind of inventory depth and quality control that trading platforms and generic distributors cannot reliably offer.
• CVD and HPHT supply across all carat ranges. We supply both CVD and HPHT certified loose lab grown diamonds — and provide expert guidance on which manufacturing method best serves your specific bulk requirements given current market pricing dynamics. For under-1.5-carat bulk purchases in particular, our HPHT supply capability offers bulk buyers access to the current market advantage in this segment.
• Flexible bulk ordering without restrictive minimums. Whether your bulk order is 10 stones or 1,000 stones, we structure supply terms around your actual business requirements. We do not impose minimum order thresholds that reflect our administrative convenience rather than your commercial reality.
• Diamond financing for bulk inventory investment. Building a substantial loose lab grown diamond inventory requires capital. Uniglo Diamonds offers flexible financing arrangements for qualified wholesale accounts — allowing bulk buyers to build the inventory their business needs without full upfront capital commitment. This financing capability is particularly valuable for growing jewelry businesses managing the balance between inventory investment and working capital.
• Fully insured, traceable European delivery. Every bulk order is shipped with full insurance coverage appropriate to the value of the shipment, complete certification documentation for every stone, and supply chain records confirming lab grown origin. Delivery to European destinations typically takes a few business days from confirmed stock availability.

The current market environment for bulk loose lab grown diamonds is the most commercially advantageous in the history of the category. The decline of lab grown wholesale prices has slowed down and is moderating — suggesting the market is approaching price stabilisation after several years of rapid decline. Bulk buyers who establish supply relationships and build inventory at current pricing levels are locking in wholesale costs at what may prove to be historically low levels, with strong retail gross margins available on every stone they sell.

By 2025, the worldwide market is expected to reach $29.73 billion, growing so that by 2034 it could reach almost $97 billion. The rise is influenced by people wanting more sustainable and inexpensive options than mined diamonds. The demand side of this market is structural — driven by demographic shifts in the primary jewelry-buying population toward buyers who actively prefer lab grown diamonds for ethical, environmental, and value reasons. Building bulk inventory at current wholesale pricing, ahead of the next phase of market growth, is the kind of strategic purchasing decision that defines the most successful jewelry businesses in any category.

Whether you are placing your first bulk loose lab grown diamond order or looking to replace or supplement an existing bulk supplier relationship — Uniglo Diamonds offers the direct manufacturer access, certified inventory depth, Antwerp manufacturing expertise, and supply infrastructure that makes us the strongest bulk sourcing option available in Europe today.

Contact our wholesale team directly. No automated systems. No generic inquiry forms. You speak with an experienced diamond professional from our Antwerp team who understands bulk purchasing requirements and can provide specific, accurate guidance on pricing, availability, matched parcels, certification, and delivery.

Contact Uniglo Diamonds:

📍 Hoveniersstraat 30, Suite 662/Bus 250, 2018 Antwerp, Belgium

📧 suraj@uniglodiamonds.com

📞 +32 03 500 91 07

Browse our current certified loose lab grown diamond inventory at uniglodiamonds.com/inventory.

All bulk purchase inquiries receive a personal response within one business day.