Sayi lu'u-lu'u hpht kan layi lab girma lu'u-lu'u 1 carat 2 carat 3 carat
Ma'auni na hpht lab girma lu'u-lu'u
| Code # | Daraja | Nauyin Carat | Tsaratarwa | Girman |
| 04A | A | 0.2-0.4ct | Farashin VVS | 3.0-4.0mm |
| 06 A | A | 0.4-0.6ct | Farashin VVS | 4.0-4.5mm |
| 08A | A | 0.6-0.8ct | VVS-SI1 | 4.0-5.0mm |
| 08B | B | 0.6-0.8ct | SI1-SI2 | 4.0-5.0mm |
| 08C | C | 0.6-0.8ct | SI2-I1 | 4.0-5.0mm |
| 08D | D | 0.6-0.8ct | I1-I3 | 4.0-5.0mm |
| 10 A | A | 0.8-1.0ct | VVS-SI1 | 4.5-5.5 mm |
| 10B | B | 0.8-1.0ct | SI1-SI2 | 4.5-5.5 mm |
| 10C | C | 0.8-1.0ct | SI2-I1 | 4.5-5.5 mm |
| 10D | D | 0.8-1.0ct | I1-I3 | 4.5-5.5 mm |
| 15 A | A | 1.0-1.5ct | VVS-SI1 | 5.0-6.0mm |
| 15B | B | 1.0-1.5ct | SI1-SI2 | 5.0-6.0mm |
| 15C | C | 1.0-1.5ct | SI2-I1 | 5.0-6.0mm |
| 15D | D | 1.0-1.5ct | I1-I3 | 5.0-6.0mm |
| 20 A | A | 1.5-2.0ct | VVS-SI1 | 5.5-6.5mm |
| 20B | B | 1.5-2.0ct | SI1-SI2 | 5.5-6.5mm |
| 20C | C | 1.5-2.0ct | SI2-I1 | 5.5-6.5mm |
| 20D | D | 1.5-2.0ct | I1-I3 | 5.5-6.5mm |
| 25 A | A | 2.0-2.5ct | VVS-SI1 | 6.5-7.5 mm |
| 25B | B | 2.0-2.5ct | SI1-SI2 | 6.5-7.5 mm |
| 25C | C | 2.0-2.5ct | SI2-I1 | 6.5-7.5 mm |
| 25D | D | 2.0-2.5ct | I1-I3 | 6.5-7.5 mm |
| 30A | A | 2.5-3.0ct | VVS-SI1 | 7.0-8.0mm |
| 30B | B | 2.5-3.0ct | SI1-SI2 | 7.0-8.0mm |
| 30C | C | 2.5-3.0ct | SI2-I1 | 7.0-8.0mm |
| 30D | D | 2.5-3.0ct | I1-I3 | 7.0-8.0mm |
| 35A | A | 3.0-3.5ct | VVS-SI1 | 7.0-8.5mm |
| 35B | B | 3.0-3.5ct | SI1-SI2 | 7.0-8.5mm |
| 35C | C | 3.0-3.5ct | SI2-I1 | 7.0-8.5mm |
| 35D | D | 3.0-3.5ct | I1-I3 | 7.0-8.5mm |
| 40A | A | 3.5-4.0ct | VVS-SI1 | 8.5-9.0mm |
| 40B | B | 3.5-4.0ct | SI1-SI2 | 8.5-9.0mm |
| 40C | C | 3.5-4.0ct | SI2-I1 | 8.5-9.0mm |
| 40D | D | 3.5-4.0ct | I1-I3 | 8.5-9.0mm |
| 50A | A | 4.0-5.0ct | VVS-SI1 | 7.5-9.5mm |
| 50B | B | 4.0-5.0ct | SI1-SI2 | 7.5-9.5mm |
| 60A | A | 5.0-6.0ct | VVS-SI1 | 8.5-10 mm |
| 60B | B | 5.0-6.0ct | SI1-SI2 | 8.5-10 mm |
| 70A | A | 6.0-7.0ct | VVS-SI1 | 9.0-10.5mm |
| 70B | B | 6.0-7.0ct | SI1-SI2 | 9.0-10.5mm |
| 80A | A | 7.0-8.0ct | VVS-SI1 | 9.0-11 mm |
| 80B | B | 7.0-8.0ct | SI1-SI2 | 9.0-11 mm |
| 80+A | A | 8.0ct + | VVS-SI1 | 9mm+ ku |
| 80+B | B | 8.0ct + | SI1-SI2 | 9mm+ ku |
4C Standard na lu'u-lu'u masu girma
Launi
Launin lu'u-lu'u mai girma na Lab yana da daraja a cikin daidaitaccen yanayi na kallo. Masana ilimin gemologists suna nazarin launi a cikin kewayon launi na D zuwa Z tare da lu'u-lu'u da aka sanya a sama, ana kallo ta gefe, don sauƙaƙe ra'ayi na tsaka tsaki.
Tsaratarwa
Tsabtace maki bisa ga ƙa'idodin da aka yarda da su na duniya a haɓaka 10X, gwargwadon ganuwa, girman, lamba, wuri da yanayin halaye na ciki da saman a wancan haɓakawa.
Yanke
Gemologists gabaɗaya ma'auni, ma'auni da kusurwoyi na facet ana kwatanta su tare da nazarin haske, wuta, scintillation da tsari don sanin Yanke Grade.
Nauyin Carat
Mataki na farko a cikin dakin gwajin lu'u-lu'u shine auna lu'u-lu'u.Nauyin Carat shine ma'aunin nauyi na daidaitattun duwatsu masu daraja.Ƙididdigar lu'u-lu'u zuwa wurare guda biyu ne don tabbatar da daidaito.
