Henan Huanghe Whirlwind is using the current domestic advanced high temperature and high pressure synthetic equipment at the level of synthetic diamond synthesis technology, the synthesis of the world's advanced level of a variety of colors and weights of man-made diamonds, plans in the production scale on the basis of additional investment of 3 billion RMB significantly expand capacity. Synthetic diamond is a poly-crystalline diamond formed by crystallization of diamonds from 10 to 30 nm in diameter. The molecular structure of synthetic diamonds is not a complete eight-body structure of a natural diamond, but rather a complex construct that produces phosphorescence. The size includes 1.4-2.0mm, 2.0-2.5mm, 2.5mm-3.0mm,3.0mm-3.5mm,3.5-4.0mm, 4.0-4.5mm,4.5-5.0mm
Q: Are you trading company or manufacturer?
A:We are diamond manufacturer since 1998.
How long is your lead time?
Generally it is 3-5 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
Do you provide free samples?
Yes, we do provide free samples, you just need to pay the delivery fee.
Do you offer OEM and ODM service?
Yes.
What is your terms of payment?
T/T 30% as deposit, and 70% before delivery. We'll show you the photos of the products and packages before you pay the balance.
What's about your after-sales service?
Generally 12 months guarantee. guarantee extension can be provide as you needed.