Igi bokan hpht Lab girma lu'u-lu'u VS VVS Clarity
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 hpht lab girma lu'u-lu'u
Launi
hpht da aka kula da launi na lu'u-lu'u an ƙididdige shi a cikin daidaitaccen yanayin 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, kallo ta gefe, don sauƙaƙe ra'ayi na tsaka tsaki.
Tsaratarwa
Tsabtace maki na hpht lu'u-lu'u da aka bi da su 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 wannan haɓakawa.
Yanke
Gemologists gabaɗayan ma'auni, ma'auni da kusurwoyi na facet an kwatanta su tare da nazarin haske, wuta, scintillation da tsari don tantance Yanke Grade na hpht da aka yi wa lu'u-lu'u.
Nauyin Carat
Mataki na farko a cikin ƙimar lu'u-lu'u da aka yi wa hpht 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.
