Product Details

What Is Lab Grown Diamonds?

Lab-grown diamonds are generally produced by high pressure high temperature (HPHT) methods or chemical vapor deposition (CVD)

HPHT, used since the 1950s, puts a pure, solid carbon source under high pressure and high temperature. In the presence of a catalyst, the pressurized and heated carbon crystalizes into diamond. HPHT is sometimes used to improve the color of mined or lab-grown diamonds.
CVD uses ultra-pure carbon-rich gases in a controlled environment. It produces Type IIa diamonds, which are quite rare in nature and account for less than two percent of all mined diamonds. Type IIa diamonds have no, or almost no, impurities; they are the purest, highest-quality diamonds.

Our proprietary CVD process allows us to produce stunning diamonds in color and size combinations that are seldom found in mines, such as fancy color pink diamonds that are prized for fine jewelry.

Note:

1.Cutting

Every Tianyu lab grown diamond gem is precisely calibrated and hand-faceted by master gem cutters to maximize brilliance and spark its ultimate fire that increases the refractive index of lab grown diamond.

2.Customized 

Any size, color,clarity,shape requirement for our diamonds and other products are almost welcomed.

Shipping & Ruturn Policy

FREE Shipping & Returns

We offer free  Epacket shipping on all moissanite and silver jewelries Order , no minimum purchase. Gold Jewelry and Diamond Order All Send by Express Method for DHL," "Fedex " "EMS Express.

Shipping fees are not refundable.  Estimated delivery time excludes weekends and holidays.  our  shipping fees and estimated delivery time as below: 

Note: the cost of express is not for Remote Address， please send us your address before order , we will check it for you!

Import duties,taxes,and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility.
Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying

Refund/Exchange Policy

If you are not satisfied with your purchase at Tianyugems.com, standard in stock items may be returned or exchanged within 10 days of first delivery attempt. The merchandise must be in original condition; we do not accept refunds for products showing any signs of wear or damage. In addition, we do not allow returns or exchanges on any altered items. These would include custom sizing, engraving and rhodium polishing, and special orders – essentially, any items that we do not usually keep in stock or that have to be custom made. At Tianyugems, we are confident that you will be thrilled with your jewelry; however, if the item is not to your liking or specifications, we feel that 10 days is enough time to evaluate your purchase.

Custom made or specially ordered pieces (including engagement rings and wedding bands) are created especially for, and based on, the exact requirements of each individual client and therefore may not be returned or exchanged.  

WARRANTY & CARE

How To Clean Your Moissanite or Diamond Jewelry

To have a clean and sparkly moissanite or diamond ring or other jewelries, you should clean it once a week or at least once every two weeks. If you wait longer, the dirt that accumulates can harden and you won’t be able to clean your jewelry by hand. Instead, you may need to have it cleaned with an ultrasonic cleaner. Besides, a lot of accumulated dirt can be harmful to the setting. The dirt creates an additional fraction that makes the metal wear more quickly.

Solid Gold

To clean your diamond jewelry at home, you should mix a little ammonia in warm water and add some mild dishwashing liquid. Stir the water and dish soap together using a spoon or your finger. Carefully place your jewelry in the liquid you have prepared and soak it for about 20-30 minutes. This will help to loosen any dirt.

Don’t use ammonia if your diamond has been fracture-filled. It may harm the filling of the stone.

After soaking, use a soft toothbrush to remove the dirt. Brush the jewelry gently not to loosen the prongs, paying particular attention to all sides and edges. Make sure you clean the lower part of the diamond as well. The base of the mounting underneath the stone is where a lot of dirt builds up. Next, rinse out the jewelry with clean water and dry it with a soft and lint-free cloth.

Gold Plated Or Gold Flashed

Maintain the beautiful shine by polishing gold plated and rose gold plated jewelry with a soft cloth. Dampen the cloth with lukewarm soapy water and rub the cloth gently on jewelry. Rinse with clean water and pat dry with a soft cloth. If jewelry requires extra cleaning, soak it for 20 to 30 minutes before rubbing. To clean the stones, soak the jewelry in a small bowl of warm water that is mixed with dish detergent; you can also gently brush the stones with a soft bristle toothbrush.

DO NOT use liquid silver or gold cleaner, ultrasonic cleaning or a tumbler. Please take off jewelry when swimming or doing other physical activities. Put on jewelry after applying lotion, hair spray, perfume or other chemicals.

Kindly be advised that it is normal for the gold plated and rose gold plating to wear off over time.