AHKAH

AHKAH QUALITY
AHKAH QUALITY

AHKAH QUALITY

The 4 Cs of diamonds

AHKAH's high-quality diamonds are rigorously selected based on the "4Cs" 
(carat, cut, color, and clarity) by our highly experienced appraiser who has earned an academic credential
from the Gemological Institute of America as a Graduate Gemologist(GIA GG).

The 4 Cs of diamonds

AHKAH's high-quality diamonds are rigorously selected based on the "4Cs" (carat, cut, color, and clarity) by our highly experienced appraiser who has earned an academic credential from the Gemological Institute of America as a Graduate Gemologist(GIA GG).    

The 4 Cs of diamonds

carat

carat carat carat

Carat (ct) is a unit to determine the weight of gemstones including diamonds. One carat is equivalent to 0.2 g, and the higher the carat is, the greater rarity value of the gemstone.​ ​

color

color color color

Color grades start with a diamond “D” and are divided into 23 grades up to Z. Colorless D color is the rarest, and the more colorless and transparent it is, the more valuable it is, because colorless is more transparent.
* AHKAH's engagement ring mainly handles D? F, which is Colorless, from H color.

cut

cut cut cut

Cut, which is the only grading in which human skill is evaluated among the evaluation criteria of diamond, expresses the elements of proportion (ratio), polish (polished state), and symmetry (symmetry) in 5 stages of EXCELLENT? POOR respectively. increase. When all three elements are excellent, it is called triple excellent (3EX), and it produces the best brilliance due to the high skill of the polishing craftsman.
* At AHKAH's engagement ring, we mainly handle 3EX from EXCELLENT cut.

clarity

clarity clarity clarity

Clarity grading measures purity of a diamond; the grades are based on examining for inclusions (internal flaws) under 10x magnification. The fewer inclusions a diamond has and the more transparent it is, the higher its rarity and value are.
AHKAH engagement rings feature diamonds ranging from the extremely rare Flawless (FL) and Internally Flawless (IF) grades through the Very Slightly Included (VS) grades.​ ​​ ​​ ​

Craftsmanship

AHKAH's delicate and exquisitely finished jewelry is the product of genuine craftsmanship and elaborate technology.
The ideas that designers seek to express through little pieces of jewelry are given tangible
form by meticulous, skilled artisans, then passed on to customers.
Every piece of AHKAH jewlery is crafted carefully and elaborately with our 
hope that they will remain as timeless and precious treasures.
.

After sales services

- To help your jewelry stay beautiful longer -

Complimentary resizing of wedding and engagement rings is 
only available one time (within one year of purchase).
We also provide complimentary polishing under the same conditions.
(Polishing helps it regain its original sparkle and shine.)
* See the aftercare section (how to store and repair) for more details.

After sales services

Complimentary cleaning is available any time at our stores.
If you live in Japan but far from a store, you can also ship your rings to us.
For details, contact the store you purchased your ring from.

  • Resizing or polishing may require a fee depending on the design. 
  • We may not be able to provide cleaning services for some items. 
After sales services

We accept free resize of the bridal ring you are looking for only for the first time (within one year after purchase).
The ring is also refreshed free of charge under the same conditions.
(It is possible to regain the same brilliance as new by refreshing.)
* For details, please check aftercare (storage method, repair, etc.). Cleaning is always available free of charge at the store. If you are far away, you can also contact us by mail. For more information, please contact the store you are looking for.

  • Resizing or polishing may require a fee depending on the design. 
  • We may not be able to provide cleaning services for some items. 
After sales services