White diamonds are selected based on the high standards of international appraisal standards [4C], and we value the individuality of the diamond that does not appear in the evaluation.

Core Jewels Diamond quality 001


The international appraisal standards [4C] applied to diamonds consist of four items: weight = carat, polishing technique = cut, transparency = clarity, and color = color.

Core Jewels Diamond quality 002


Carat (ct) is a unit of measurement of diamond weight, and 1 carat = 0.2 grams.

Core Jewels Diamond quality 003


Cutting is the only manual technique used to bring out the brilliance of a diamond, and it is graded based on polishing, symmetry, and proportion, and at Core Jewels we only use high-grade diamonds that fall under [Triple Excellent], [Excellent], and [Very Good]. Doing.

Core Jewels Diamond quality 004


Clarity is the transparency of a diamond, determined by the size, location, and number of surface flaws and inclusions. At Core Jewels, we use the [IF] class, which has extremely high clarity, and the [VS2] class, which makes it difficult to detect inclusions even with the naked eye or even with 10x magnification.

Core Jewels Diamond quality 005


As a guide for diamond color, DEF = colorless and transparent, GHIJ = almost colorless, KLM = faint yellow, NR = very light yellow, and SZ = pale yellow. Core Jewels uses classes [D] to [H].


Core Jewels uses only the highest quality [EXCEPTIONAL BLACK] black diamonds that do not dye with any color.

Core Jewels Diamond quality 001


At Core Jewels, we have established four appraisal criteria: color, cut, presence of scratches, and shine, and evaluate the grade in three stages: [EXCEPTIONAL BLACK], [RARE BLACK], and [BLACK], and only [EXCEPTIONAL BLACK], which is the highest standard, is used. We carefully select and use.

Core Jewels Diamond quality 002


A gemstone identification book is the result of analyzing and inspecting a gemstone from a scientific approach and identifying the type of stone. At Core Jewels, we issue a gemstone identification certificate commissioned by a specialized organization and attach it to our jewelry to prove that it is a natural diamond.

*Gemstone identification documents will be issued free of charge for diamonds of 0.3 ct or more (0.2 ct for engagement rings only) and bead diamonds of 5.0 ct or more.