Huanghe Whirlwind rough diamond adopts the current domestic advanced high temperature and high pressure synthesis of artificial diamond synthesis technique equipment level, the synthesis with various colors and weight of the world's advanced level of artificial diamond, plan on the basis of the scale of production increase investment of 3 billion yuan to expand capacity significantly.The synthetic diamond is a polycrystalline diamond made from diamond crystals of 10 to 30 nanometers in diameter.The molecular structure of a synthetic diamond is not a complete octahedral structure of a natural diamond but a complex structure that produces phosphorescent phenomena.
Q: Are you trading company or manufacturer?
A:We are 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?
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.