Loose diamond

Professional buyers must prioritize the 4Cs: Carat, Cut, Color, and Clarity. For investment or high-end jewelry use, focus on 'Triple Excellent' (3EX) ratings in Cut, Polish, and Symmetry. Ensure the diamond is conflict-free and ideally accompanied by a GIA or IGI grading report, which serves as the 'passport' for the stone's value.

Natural diamonds hold higher resale value and rarity, making them suitable for luxury branding. Lab-Grown Diamonds (LGD), produced via CVD or HPHT methods, offer identical physical properties at a 70-90% lower cost, appealing to eco-conscious and budget-friendly market segments. Always require clear disclosure and separate certification to prevent inventory mixing.

Suppliers must adhere to the Kimberley Process Certification Scheme (KPCS) to ensure diamonds are not 'blood diamonds.' Additionally, look for members of the Responsible Jewellery Council (RJC) to guarantee ethical labor practices and environmental stewardship throughout the supply chain.

Fluorescence can reduce the price of a diamond by 10-25%. While 'Medium' or 'Strong' blue fluorescence can make yellowish diamonds (I-M color) look whiter, it can make high-color diamonds (D-F) appear milky or hazy, significantly lowering their marketability in the B2B sector.

The primary risks include grading discrepancies and synthetic substitution. To mitigate this, use third-party inspection services and ensure the laser inscription on the diamond's girdle matches the provided certificate. Always conduct transactions through secure channels like Made-in-China.com's secured payment systems to protect your capital.

Negotiate based on the Rapaport Price List (Rap List). Professional buyers usually negotiate a percentage discount off the Rap price. For bulk loose stones (parcels), ask for 'original bag' pricing and clarify the 'sieve size' and 'clarity mix' to ensure consistency across the lot.

Never use standard courier services for high-value shipments. Utilize specialized armored logistics such as Brink’s, Malca-Amit, or Ferrari Logistics. Ensure the shipment is covered by 'Door-to-Door' marine cargo insurance and that the commercial invoice accurately reflects the HS Code (7102) for smooth customs clearance.

Prioritize Audited Suppliers on Made-in-China.com. Check their years of operation, trade records, and participation in major jewelry fairs (like HKCEC or JCK). Request a live video inspection of the stones under a loupe or microscope before finalizing the wire transfer.