SINODIAM INTERNATIONAL · SPECIALTY DIAMOND MATERIALS
Lab-grown rough diamond selection for professional cutting, faceting and jewelry manufacturing.
Compare SinoDiam Grade B and Grade A according to rough crystal appearance, growth features, weight, inclusions and the actual requirements of your cutting process. Every parcel should be evaluated on its own characteristics.
Two commercial selection options · Actual-lot evaluation · Professional sourcing
WHY HPHT ROUGH
HPHT lab-grown rough diamonds are supplied as feedstock for subsequent diamond cutting, faceting and selected jewelry manufacturing. Selection should be based on representative lot information and intended processing requirements.
High Pressure High Temperature growth produces laboratory-grown diamond crystals. Relevant origin or treatment details should be verified for the specific parcel.
Select by crystal morphology, visible growth structures, inclusions, apparent color and rough size rather than by an assumed polished-stone outcome.
SinoDiam Grade A and Grade B are internal commercial rough-selection categories; they are not laboratory-issued clarity grades for uncut stones.
HPHT SERIES · TWO SELECTION OPTIONS
The two SinoDiam options serve different commercial inspection priorities. The images illustrate HPHT rough crystal handling and evaluation, not certified grade differences or a guaranteed parcel specification.
GRADE 01 · COMMERCIAL SELECTION
Commercial visual-selection option
A starting option for commercial cutting and faceting projects where rough shape, apparent color, inclusions, available usable regions and procurement cost must be assessed against the intended product.
Legacy label: SI1–SI2 (historical reference only)
Selection focus: Commercial cutting and faceting trials
View Grade B Product Details →GRADE 02 · PREMIUM SELECTION
Premium visual-selection option
A selection pathway for buyers evaluating higher-transparency rough and demanding faceting projects. Assess each lot by actual appearance, internal features, dimensions and potential orientation-dependent cut planning.
Legacy label: VS–VVS (historical reference only)
Selection focus: Precision cutting and premium-selection trials
View Grade A Product Details →TECHNICAL COMPARISON
Compare SinoDiam commercial selection positioning and lot-evaluation priorities before reviewing the Grade A or Grade B product specifications.
Important: SinoDiam Grade A/B are internal commercial selection categories. Earlier SI1–SI2 and VS–VVS descriptions are not certified grades for rough stones and do not predict the grade, yield or appearance of the final polished diamond. Rough weight, color, inclusion characteristics and available documentation must be confirmed for each lot.
APPLICATION SELECTION
The suitability of a rough diamond is determined by its actual characteristics and intended processing route. A commercial selection label alone does not establish the resulting polished-stone quality.
Evaluate representative rough parcels for suitable cutting plans, usable crystal regions, and downstream polishing and finishing needs.
Assess individual crystal clarity, visible growth features, orientation, size and expected cutting requirements for demanding projects.
Discuss rough diamond sourcing for jewelry production with attention to lot consistency, actual appearance, rough weight and cut-planning requirements.
Compare batch quantities, photographs, sample-inspection options, treatment disclosure and shipment requirements before commercial commitment.
GRADE SELECTION
Start with your intended polished product and examine the actual rough lot. Neither Grade A nor Grade B is a universal quality guarantee.
STEP 01
Specify the intended cut, approximate finished size, shape, expected quantity and application.
STEP 02
Review photographs, morphology, color appearance, visible inclusions and rough size distribution.
STEP 03
Consider Grade B and Grade A against the same lot-level acceptance criteria and intended processing objectives.
STEP 04
Request any available lot records, growth or treatment disclosures and sample or inspection details.
STEP 05
Confirm quantity, inspection basis, packaging, shipping destination and a quotation for the agreed material.
TECHNICAL FAQ
Key considerations for rough-stone selection, commercial labels, inspection and procurement.
They are synthetic diamond crystals grown through a High Pressure High Temperature process and supplied before final cutting or faceting. Rough crystals require individual evaluation for the intended end use.
Grade B is a commercial visual-selection option; Grade A is positioned for premium visual-selection evaluation. Final requirements must be defined through actual parcel characteristics and agreed inspection criteria.
No. VS–VVS is retained only as a historical marketing reference. SinoDiam Grade A is not a certified rough-stone clarity grade, and polished quality depends on the specific crystal and cutting outcome.
No. SI1–SI2 is a historical commercial descriptor only; it is not a laboratory-issued grade for rough stones or a guarantee of the final polished grade.
Available rough weight, color appearance, size distribution and quantity vary by lot. Earlier materials referenced approximately 0.5–5.0 ct, but current supply must be checked rather than inferred from those older listings.
No. These images are representative HPHT rough-diamond photographs. Buyers should request current lot photographs, appropriate inspection evidence or physical samples for a particular purchase.
Please include the intended cutting or jewelry application, preferred Grade A or Grade B, target rough weight or dimensions, color or visual requirements, quantity, inspection needs, destination country and delivery expectations.
SINODIAM · TECHNICAL SUPPORT
SinoDiam supports buyers and manufacturers with selection of HPHT lab-grown rough diamonds for faceting and jewelry manufacturing. Share your preferred commercial grade, intended cut, rough weight or size, appearance requirements, estimated quantity, lot-inspection needs and destination country.
Request Technical Information & QuotationEmail: info@diamondmicron.com
