5 cent diamond: about 2.5 mm in diameter and 1.5 mm in height.
20 cent diamond: about 3.8 mm in diameter and 2.3 mm in height.
30 cent diamond: about 4.5 mm in diameter and 2.7 mm in height.
50 cent diamond: about 5.2 mm in diameter and 3. 1 mm in height.
70 cents diamond: about 5.8 mm in diameter and 3.5 mm in height.
1 carat diamond: about 6.5 mm in diameter and 3.9 mm in height.
2-carat diamond: 8.2 mm in diameter and 4.9 mm in height.
3-carat diamond: about 9.4 mm in diameter and 5.6 mm in height.
The weight of diamonds is calculated in carat (CT). 1 carat = 0.2g = 100 min. 0.5 carat =50 minutes, 30 minutes =0.3 carat. With the increase of diamond weight, the value of diamond increases in an irregular geometric series, which is called carat ladder. Generally speaking, only diamonds weighing more than 50 cents begin to have collection investment value.
How to maintain diamonds:
1, diamond is the hardest gem, but it is not indestructible. It is fragile to some extent, and may be damaged by heavy blows, and it will loosen from the aging ring retainer. It is also best not to put it with other diamond ornaments. When doing housework or other physical labor, it is best to take off the diamond jewelry and put it away, so as to avoid accidentally touching hard objects and causing damage to the diamond.
2, diamond jewelry is best placed separately. When collecting and keeping diamond ornaments, they should be placed separately to avoid being mixed with other jewelry, otherwise hard diamonds will scratch other jewelry. In particular, it should be separated from gold jewelry. Gold is soft, and it is easy to be damaged when it is put together with diamond ornaments, and it is also easy for gold to make platinum for inlay yellow, which affects the color.
3. Try to avoid direct contact with the diamond surface with your fingers. Diamonds are lipophilic, and the oil on the epidermis will adhere to the surface of diamonds, which will affect the luster and brightness of diamonds. In the long run, diamonds will look gray. After touching the diamond, it is also best to wipe it with a soft cloth in time.
4. Check the diamond situation regularly. For finished diamond ornaments, it is best to check the setting of diamonds regularly, such as touching diamonds with tweezers to see if they shake. Or send it directly to the jewelry store for inspection.