Both HPHT (High Pressure High Temperature) and CVD (Chemical Vapor Deposition) are 100% real diamonds with identical optical and chemical properties. HPHT excels in producing exceptionally colorless (D-F) small to mid-size solitaires and melee, while CVD is widely used for larger carat roughs and specific fancy color adjustments. At ZKZ Diamonds, we supply both technologies based on your target price and design specs.

Yes. All our major loose lab-grown diamonds (typically 0.5ct and above) come with authentic certificates from internationally recognized institutions, including IGI (International Gemological Institute) and GIA. Each certified diamond features laser inscription on its girdle matching the certificate number.

We offer flexible MOQs to support emerging e-commerce brands and established retail chains alike. For loose certified solitaires, there is no strict minimum (1 piece is acceptable for sample testing). For custom OEM/ODM jewelry orders, our MOQ usually starts at 5-10 pieces per design depending on metal and casting requirements.

Our standard turnarounds are among the fastest in the industry: 3D CAD modeling takes 24–48 hours; sample production takes 7–10 days; and bulk order production takes 12–18 business days. All shipments are dispatched via fully insured global express services (such as FedEx/DHL), delivering door-to-door within 3–5 business days.

Absolutely. We strictly protect our clients' intellectual property with non-disclosure agreements (NDAs) and custom laser hallmarking (your brand logo, metal purity, and serial numbers). We also provide discreet blind dropshipping services directly to your end customers without any ZKZ branding materials attached.