3. D 1.50ct, ct is what we usually call carat, and d 1.50ct means that the diamond on this diamond ring is one carat.

In addition, platinum also includes PT900 and PT990. PT900 has relatively low purity and high hardness. Although the content of PT990 is high, it is soft, and PT950 is the best.

Extended data:

Precautions for maintenance of platinum ring:

1. Place the platinum ring separately in the jewelry box or drawer to avoid scratching.

2. The method of cleaning the platinum ring regularly is to soak the platinum ring in hot soapy water, gently wipe the grease with a soft brush, rinse it with clear water, then blow dry it with a hair dryer, or take it to a jewelry store for professional maintenance and cleaning.

3. Due to the high ductility of platinum jewelry maintenance, it is necessary to be careful not to pull necklaces and other accessories frequently, and platinum ring maintenance should be more careful not to entangle hair.

4. When cleaning the house, you should take off the platinum ring first, because liquids such as detergents will darken the color of the platinum ring during maintenance.

Generally, the platinum ring will not be worn until the last step of dressing up, because the chemical reaction of perfume, hair gel and other chemicals will cause damage to the K platinum ring.

6. Don't swim with a platinum ring. Salt water and chlorine water are not only easy to lose, but also damage platinum rings.

7. When working outdoors or hard work, the ring can be removed to avoid extrusion deformation or fracture at work.