Diamond Price Breakdown: Costs and Pricing of Natural and Lab-Grown Diamonds
Updated: Oct 21
Among our recent quotations for one-carat round diamonds, a natural loose diamond with D colour, VVS2 clarity, 3EX and no fluorescence is approximately HK$46,200–49,400 (about NT$184,800–197,600). A lab-grown loose diamond with the same headline specifications is approximately HK$2,800–3,200 (about NT$11,200–12,800). The weight is the same, but the routes to obtaining and producing the rough material are very different.
Natural diamond pricing starts with geological exploration, mine development and the supply of particular rough qualities. Lab-grown diamond pricing starts with growth equipment, seeds, technical control and production yield. Both then require cutting, grading, transport, quality selection and retail service. Looking at these stages makes it easier to understand what a diamond's price includes.
Contents
1 Recent Reference Prices for a One-Carat Diamond
The following loose-diamond reference prices come from our diamond selection data dated 20 October 2026. The comparison fixes the main specifications at 1.00 carat, round shape, D colour and VVS2 clarity, with Excellent cut, polish and symmetry (3EX), and no fluorescence.[1]
Diamond type | Loose-diamond reference price | Grading report |
Natural diamond | About HK$46,200–49,400; about NT$184,800–197,600 | GIA |
Lab-grown diamond | About HK$2,800–3,200; about NT$11,200–12,800 | IGI |
These rounded prices are for budgeting and exclude the setting. Taiwan dollar amounts use a budgeting assumption of HK$1≈NT$4, rather than a live exchange rate or a formal quotation from our Taiwan stores. Actual prices, availability and local-currency quotations are subject to confirmation. Report systems, individual proportions and the appearance of each diamond should also be checked together.
The two charts below use hypothetical teaching allocations to explain the composition of a selling price. Their percentages are assumptions chosen for illustration, with amounts calculated from those percentages. They are not RAGAZZA's actual costs or industry averages. The eight stages include the relevant processes, professional services and commercial pricing, totalling 100%; each stage is explained afterwards.
2 Eight Stages from Mine to Finished Natural Diamond
Using a natural loose diamond priced at HK$46,200 (about NT$184,800), this illustrative model allocates 65% to exploration, extraction and the supply value of rough quality, 12% to cutting and polishing, and the remaining 23% to grading, trading, transport and retail support. The numbered chart connects the overall distribution with the work described below.
Stage 1 Geological Exploration and Mine Development
The first investment in natural diamond supply often takes place long before rough diamonds are recovered. Geologists investigate formations, drill samples and assess the deposit and its commercial viability before a decision is made to develop mine workings, processing plants, roads, electricity and water supplies. Moving from a diamond-bearing formation to an operating mine requires capital, specialist judgement and time, with the risk that exploration will not lead to commercial production.[2]
Stage 2 Mining and Mineral Processing
Rough diamonds are usually mixed with large volumes of rock or sediment. Mines extract and transport this material, then use processes such as crushing, screening and sorting to recover diamonds. Heavy machinery, processing equipment, fuel, electricity, labour, maintenance and safety management all require continuing expenditure. Environmental management, rehabilitation and applicable mining charges also form part of the operation. Deposit depth, ore grade and mining method affect the resources required.[2]
Stage 3 Rough Quality and Supply Value
Recovered natural rough varies in size, shape, colour and inclusions. Sorters assess which material can produce larger centre stones and which is suitable for smaller diamonds or other quality ranges. Rough capable of yielding a full one-carat polished diamond with both high colour and high clarity cannot be supplied to order by every batch of mined material.
Natural diamond pricing therefore also reflects the difficulty of obtaining a particular quality and the demand for it. GIA's explanation of quality factors identifies the rarity of particular colours, clarity grades and weights as influences on value. This model groups that supply and quality component under “Rough Quality and Supply Value”, separately from exploration and mining expenditure. It helps explain why rough diamonds recovered at similar extraction costs can have different market values.[3]
Stage 4 Cutting Plans and Skilled Craftsmanship
Rough is planned before cutting begins. Three-dimensional scanning, inclusion mapping and planning software help compare combinations of shape, weight, clarity and cutting proportions. Laser sawing, shaping and facet polishing then gradually produce a finished loose diamond. Equipment, software, consumables, the cutter's experience and processing time all contribute to this stage.[4]
Cutting also involves trade-offs. Avoiding inclusions or achieving suitable proportions may require giving up some weight. The entire weight of a piece of rough will not remain in a single centre stone; manufacturers plan the saleable polished output, any usable remaining material and the weight removed during cutting together.
Stage 5 Grading and Quality Information
After polishing, a diamond can be submitted to an independent laboratory to examine its origin, treatment status and applicable quality grades. Grading requires trained people, standardised viewing conditions and testing equipment, producing report information that can be checked. This provides a starting point for confirming identity and comparing quality when we select diamonds.
The report must still be matched to the stone. Weight, dimensions, report number and the diamond's own characteristics help with that check. A report records quality information; the appearance and suitability of an individual diamond require further assessment through imagery and physical inspection.[5]
Stage 6 Specialist Sorting and Trading Services
The journey from rough to jewellery-ready loose diamonds involves several specialisms. Rough sorting, cutting, polished-diamond grading, sourcing and matching require skilled judgement and supply networks, alongside inventory, funding and delivery arrangements. Some businesses integrate several stages; others work with specialist partners. These services direct diamonds of different specifications towards suitable jewellery manufacturing and retail needs.
Stage 7 Transport and Cross-Border Arrangements
Moving a diamond from its processing, grading or supply location to the sales market requires secure packaging, transport insurance, documentation and handover management. Cross-border sourcing may also involve currency conversion, payment and applicable local tax procedures. The resources required depend on shipment size, route, delivery timing and transaction terms.
Stage 8 Quality Selection and Retail Service
We are selecting the diamond a customer will ultimately wear, so our assessment extends from the report to its actual appearance. Checking proportions and dimensions, reviewing imagery and physical stones, advising customers and arranging delivery require professional staff and continuing operational support. Stores, the website and after-sales service also form part of bringing the finished product to its wearer.
The one-carat natural loose-diamond reference price at the beginning reflects the conditions for obtaining a particular natural quality, together with cutting, grading and delivery. Demand for natural origin and the supply of specific qualities also influence the final market price.
3 Eight Stages from Seed to Finished Lab-Grown Diamond
For the second teaching example, consider a lab-grown loose diamond priced at HK$3,000 (about NT$12,000). This model allocates half to equipment, materials, energy and production yield, and half to cutting, grading, delivery and retail support. Production can be repeated, spreading equipment and technical investment across successive batches. Once a crystal has grown, it still needs to be processed and selected into a jewellery-ready loose diamond.
Stage 1 Growth Equipment and Facilities
Lab-grown diamonds grow under controlled conditions. CVD production uses reaction chambers, microwave power, vacuum, gas and cooling systems; HPHT production uses high-pressure equipment with appropriate temperature and pressure controls. Facilities, equipment purchase, installation, maintenance and depreciation provide the production foundation. Equipment can be reused over many cycles, so utilisation and available capacity affect the cost allocated to finished output.[6]
Stage 2 Seeds and Growth Materials
A seed provides the base on which the diamond crystal continues to grow. It must be selected, cut and surface-prepared. CVD growth uses carbon-containing gas and hydrogen, while HPHT uses a suitable carbon source, metal solvent-catalyst materials and reaction components. Seed condition, material purity and consumables management influence growth stability.[6]
Turning carbon into a diamond crystal suitable for jewellery requires carbon atoms to keep arranging themselves in the diamond crystal structure. Alongside the materials, equipment and stable growth conditions make that process possible.
Stage 3 Energy and Technical Control
Growth requires a continuing supply of power, cooling and monitoring. Temperature, pressure, gas proportions and power settings affect crystal quality. GIA research into CVD diamonds shows that variations in growth conditions can change impurity incorporation and growth structures. Stable control of these parameters requires both equipment and technical expertise.[7]
Growth time, energy use and the experience of the technical team therefore form another part of the investment. More mature production control can improve consistency across successive cycles and help reduce rework.
Stage 4 Saleable Yield and Post-Growth Treatment
The crystals produced in each cycle can differ in size, colour, clarity and structural integrity. Producers assess which material suits the intended product, which needs a different cutting plan, and which may require post-growth treatment. Some CVD material undergoes treatment to improve colour; other material reaches the required colour grade in its as-grown state.[6][7]
The equipment and energy invested in a cycle must be supported by its usable output. Increasing qualifying output and reducing material defects and rework can lower the cost allocated to each saleable stone. The pricing foundation of lab-grown diamonds is therefore closely linked to technical maturity and production efficiency.
Stage 5 Cutting and Polishing
Grown rough still requires planning, sawing, shaping and polishing. Its form, inclusions and growth structures influence the cutting plan; finished dimensions, proportions and optical performance depend on the combination of material and workmanship. Laboratory growth changes how rough is obtained. Producing a jewellery-ready loose diamond afterwards still involves specialist processing and decisions about weight retention.[4][6]
Stage 6 Grading and Origin Identification
Lab-grown origin must be clearly disclosed, with quality and treatment information presented through an applicable report system. Independent laboratories combine conventional gemmological observation with the necessary instrumental testing to establish diamond identity and relevant characteristics. Reports provide checkable quality information and clearly distinguish natural from laboratory-grown origin.[6]
Stage 7 Sourcing and Delivery Management
After cutting and grading, diamonds still need sourcing, data checks, packaging, transport and handover. When a jewellery design requires a pair or several matching diamonds, dimensions, colour tone and overall appearance must also be compared across candidates. This requires supply coordination, individual inspection and delivery management.
Stage 8 Selection Standards and Retail Support
For us, selecting a lab-grown diamond means considering the light performance, dimensions and visual harmony it will bring to a finished piece. Stones with similar reports still need their proportions, imagery and physical appearance checked. Selection, advice, delivery and after-sales support are part of the complete product a customer purchases.
The one-carat lab-grown loose-diamond reference price at the beginning includes crystal production, cutting, grading and finished-stone supply. Technical advances and expanding production capacity have improved supply efficiency for common specifications; we continue to inspect each finished diamond according to the needs of the jewellery.
4 From a Loose Diamond to a Complete Piece of Jewellery
Metal, Design and Manufacture Around the Centre Stone
Once a loose diamond is ready, it must be combined with a jewellery design. Metal weight, the number of accent diamonds, structure, setting complexity and finishing all affect the manufacturing work involved. The same centre diamond can produce different complete-jewellery quotations when used in a simple solitaire or a more elaborate design.
For our rings, the complete price is the centre-diamond price plus the ring-setting price. The setting price includes the metal, stone setting, manufacture, design-specific accent stones and services for that style, with no separate charges for those items. Once the centre diamond and design are selected, we quote for the complete combination.[8]
Price component | What it includes | What to confirm together |
Centre diamond | A polished loose diamond with the specified grading report | Origin, 4Cs, dimensions, proportions and actual appearance |
Ring setting | The style's metal, setting work, manufacture, accent stones and services | Design, material, structure and included items |
Complete ring | Centre diamond plus ring setting | Local-currency quotation, availability and delivery arrangements |
We Consider Diamond Selection and the Finished Jewellery Together
Our focus is high-end lab-grown diamond jewellery. Alongside centre-stone weight, we consider cutting proportions, actual light performance, coordination with accent stones and the quality of the setting. For round brilliant diamonds, we combine reports, imagery and physical checks, using the DAII™ Diamond Quality Index to support comparison. Our round diamond selection and inspection process explains the work in more detail.[9]
These stages turn a loose diamond into a complete piece of wearable jewellery. When confirming a quotation, consider the centre-stone quality, design materials, manufacture and delivery together. For budgets at other carat weights, see our lab-grown diamond price guide.[8]
5 Frequently Asked Questions About Diamond Prices
Q1: Why Is There Such a Large Price Difference Between Natural and Lab-Grown Diamonds?
Answer: The main difference comes from how the rough is obtained and the conditions of its supply. Natural diamonds involve exploration, mine development, extraction and mineral processing, while rough of a particular size and quality is also constrained by natural supply. Lab-grown diamonds grow under controlled conditions using reusable equipment. Production technology, output and yield affect the investment allocated to each stone, creating a different pricing foundation.
Q2: What Are the Main Production Costs of Lab-Grown Diamonds?
Answer: They include growth equipment and facilities, seeds and materials, energy, technical staff and monitoring, and any necessary post-growth treatment. Each cycle can also produce material that does not meet the target specifications; its production inputs need to be supported by saleable output. Equipment efficiency, growth stability and qualifying yield therefore all affect production costs.
Q3: How Does Weight Removed During Cutting Affect the Cost of a Finished Diamond?
Answer: Some weight must be removed to achieve a suitable shape and proportions or to avoid inclusions. The amount of saleable polished output affects how rough-material and processing inputs are allocated. Manufacturers also assess whether the remaining material can yield other diamonds, considering the usable output of the whole piece of rough together.
Q4: What Else Does a Diamond's Selling Price Include Beyond Rough Material and Cutting?
Answer: It also involves independent grading, sorting and matching, inventory and funding arrangements, transport insurance, documentation and handover management, and retail quality selection, advice and after-sales service. This work turns a polished diamond into a product with checkable information and screened quality that can be delivered to a customer.
Q5: How Is the Complete Price of Diamond Jewellery Put Together?
Answer: The complete price includes the centre diamond and the jewellery manufacturing that supports and complements it. For our rings, the quotation is calculated as “centre-diamond price + ring-setting price”. The setting includes the style's metal, setting work, manufacture, accent stones and services. Metal weight, accent-stone quantity, structure and setting complexity all affect this part of the price.
6 References
[1] RAGAZZA DIAMOND — Diamond selection: specified reference prices, 20 October 2026
[2] De Beers Group — Diamond value chain
[3] GIA — Diamond Quality Factors
[4] Sarine — Advisor Tenders Rough Planning
[5] GIA — Diamond Grading Reports and Appraisals
[6] GIA — Laboratory Grown Diamond Update 2024
[7] GIA — CVD Diamonds from Plasmability 2025
[8] RAGAZZA DIAMOND — Lab Grown Diamond Prices 2026: 1, 2 and 3 Carat Guide
[9] RAGAZZA DIAMOND — Round Diamond Selection and Inspection Process
