How much is a 29ct diamond worth

Diamond grading

Diamonds are named after the "4C"graduated:

  • Color (Colour)
  • Cut (Cut)
  • Clarity (Purity)
  • Carat (Weight)

The transitions between the individual classes are very fine and fluid, so that a certain technical effort as well as in-depth specialist knowledge and experience are required to be able to determine a stone precisely. Our in-house diamond appraiser was trained in diamond grading by the Gemmological Training Center Idar-Oberstein of the DGemG (German Gemmological Society).

Color - shade of the diamond

D / EF / GHI / JK / LM / NO / PQ / RS / Z
Blue WhiteFine whiteWhiteFaintly tinted whiteToned whitePale yellowishyellowishPale yellowYellow / brown
RiverTop WesseltonWesseltonTop crystalTop capeCape-YellowYellowFancy yellowYellow-Brown

The main chemical component of a diamond is cubic crystallized carbon. When diamonds are formed, however, it is almost the rule that in addition to carbon, small amounts of other elements such as nitrogen or boron are included in the crystal structure. This in connection with the influence of natural radioactive earth radiation creates diamonds in almost every color. In principle, due to their relative rarity, the following applies: the whiter, the more expensive, the more yellow / brown, the less valuable. Extreme colors such as blue, pink or green, so-called fancy colors are also rare and expensive, provided the color is of natural origin. In the jewelry sector, however, these colored diamonds are almost always artificially color manipulated.

Cut - the shape and proportions of a diamond

Type and shape of the cut

The 7 most common cuts are:

  • Brilliant cut
  • Heart cut
  • Oval cut
  • Princess cut
  • Pear cut
  • Emerald cut
  • Marquise cut

The brilliant cut is the most common diamond cut.
A diamond has at least 32 facets.

Proportion of the cut

Very good
(very good)
Outstanding brilliance. Very good proportions. In relation to the girdle diameter (= 100%): table size between 52 and 64%, upper part height between 12 and 18%, lower part height between 42 and 45% and girdle thickness less than 3%.
Good brilliance. Proportions with minor deviations (up to max. 5%). Weakly disturbed symmetry.
Noticeably reduced brilliance. Proportions with considerable deviations (max. 10%). Broken symmetry.
Significantly reduced brilliance. Proportions with very clear deviations. Strongly disturbed symmetry

The right proportion is important so that the light is reflected at the right angle within the stone and the diamond gets a glowing "fire".

Clarity - the purity / inclusions of a diamond

Clarity - Clarity of the diamond rated at 10x magnification



Absolutely flawless, no inclusions visible

GIA: if


Very, very small inclusions

Very, very small inclusions, difficult to see at ten times magnification

GIA: vvs1, vvs2


Very small inclusions

Very small inclusions, difficult to see at ten times magnification

GIA: vs1, vs2


Small inclusions

Small inclusions, easy to see at ten times magnification

GIA: si1, si2


Clear inclusions

Inclusions immediately visible at 10x magnification, not reducing the brilliance

GIA: l 1


Larger inclusions

Larger and / or numerous inclusions that slightly reduce the brilliance. Can be seen with the naked eye

GIA: l 2


Big inclusions

Large and / or numerous inclusions, considerably reducing the brilliance

GIA: l 3

Carat - weight / size of a diamond

Diamonds have the unit of weight carat, whereby one carat corresponds to 0.2 g. The size of a stone can be used to estimate its weight. In order to graduate a stone exactly, however, you have to weigh it, which is why the carat determination by size measurement is mainly used for set stones.


Carat - weight of the diamond in carats

ESG diamond purchase / trade

Diamonds are a mass product in the jewelry sector.

Due to the high volume of old gold, thousands of carat jewelery diamonds are valued, purchased and sold to diamond dealers for re-use in the jewelery sector every year. We are not interested in investment diamonds.

For the purchase process