ArticleeducationNews

Cut – The 4 Cs Of Gemstones

By 19.06 September 20th, 2018 No Comments

CUT – one of the 4Cs of Gemstones

The 4Cs of Gemstones describe the cut, colour, clarity and carat weight of a stone,
each of these four categories defining the stone and assessing its value. This system, developed by the Gemological Institute of America in the 1940s – 1950s, is well-defined for diamonds; however, although used for other gemstones, it is not accepted universally, as gemstone 4Cs have different implications. We will explore gemstones cuts, what these mean for the beauty and the value of the stone and how to go about choosing the correct cut.

The Purpose and Shape of a Gemstone’s CUT

Gemstones are found in various colours, many of which are truly spectacular. In order to preserve the intense colour, it is imperative that these gemstones are cut with particular care and that the correct cut is chosen for each stone.

The cut displays the gem’s beauty and depth of colour, its shape and its faceting style. Stone size, colour, inclusions and clarity all have to be taken into consideration by the cutter in order to provide the gemstone with its best symmetry and proportion dimensions. The most relevant objectives would be a pleasing symmetry and well-defined facets junctions, light reflection, and smooth, flawless polishing.
Gemstone cutters strive to preserve and enhance colour, maintain size and maximum carat weight, and reduce inclusions to improve the stone’s clarity, in order to yield the best symmetry and proportion in a high quality cut. All of these considerations will affect the value of each stone, so when purchasing a stone ensure that the cut quality is the first priority.

Examples of cuts and colours of Tourmaline

Flawless coloured gemstones are more rare than flawless diamonds and clarity is not as important as that in diamonds. An example is with emeralds – the natural process in the formation of emeralds is a violent one, which results in natural flaws found in even the most valuable emeralds. The darker the colour of gemstones, the easier it is to hide flaws. Generally, these flaws do not affect the stone’s value.

The external structure of a gemstone is similar to that of a diamond. At the centre of the stone’s surface is the table, the whole top part is the crown, the girdle is the top third of the stone’s body or pavilion and the culet is the lowest part of the stone.

 

The cut affects the final shape of the stone.

The market standard cut for rubies and sapphires is the mixed cut (brilliant crown and step pavilion) while the step cut is more usual for emeralds.

The girdle outline defines the shape of which there are many choices such as the more common oval and cushion shapes to the more rare emerald and round shapes. The shape generally relates to the original rough shape.

[/et_pb_text][/et_pb_column_inner][/et_pb_row_inner][/et_pb_column][et_pb_column type=”1_4″][et_pb_text admin_label=”Text” background_layout=”dark” text_orientation=”left” header_font=”Roboto||||” text_font=”Roboto||||” text_font_size=”12″ background_color=”#3b341a” use_border_color=”off” border_style=”solid” custom_padding=”5px||5px|” disabled=”off” border_color=”#ffffff”]
Clarity

clarity_slider

×
Color

color_slider

×
Carat

The international unit of weight, used for measuring diamonds and gemstones. 1 carat is equal to 200 milligrams, or 0.2 grams.

×
Clarity

clarity_slider

×
Color

color_slider

×
Cut

Nothing is more impactful on a precious stone’s brilliance than its cut. The cut refers to the angles and proportions of a diamond. Known in the industry as ‘fire’, referring to the coloured light reflected, and ‘brilliance’ for the uncoloured light. The cut of a diamond – its form and finish, its depth and width, the uniformity of the facets – determines its beauty. The skill with which a diamond is cut determines how well it reflects and refracts light. A diamond should be cut proportionally, neither very shallow not very deep, given its dimensions. A diamond’s cut is its most important characteristics and a measure of its apparent beauty.

×
Certificate

A diamond certificate or grading report provides an expert opinion on the quality of the diamond and is provided by an independent gemology lab. Trained gemologists with specialized equipment measure the weight and dimensions of the diamond and assess quality characteristics such as cut, color, and clarity. Brilliant Earth diamonds are certified by the world’s leading gem grading labs including GIA, IGI, and GCAL.

×
Depth

The height of a diamond, from the culet to the table referred as a Depth of the diamond . Depth % is the height of the diamond as a percentage of the girdle diameter.

diamond_depth

×
Table

Table referred as the largest facet of a gemstone, located at the top. Table % is the table width as a percentage of the girdle diameter.

diamond_table

×
Polish

Polish refers to the smoothness of the exterior of a diamond. Polish is graded from Ideal, Excellent, Very Good, Good, Fair, or Poor. Polish grades of Good or higher have the least effect on the brilliance of the diamond and recommended by us for the finest quality jewelry.

×
Symmetry

Symmetry refers to the angles to which the facets are aligned. Basically exactness of the shape of a diamond, and the symmetrical arrangement and even placement of the facets. If facets are misaligned, the diamond may poorly reflect light. Symmetry is graded from Excellent, Very Good, Good, Fair, or Poor. We recommends diamonds with Good or higher symmetry grades.

×
Fluorescence

Describes the diamond’s response to ultraviolet light. In diamonds with strong or very strong fluorescence, there may be some interference with the flow of light which causes a milky or oily appearance. Canadian diamonds almost always have none to slight fluorescence.

×
Measurements

Diamonds with “fancy” shapes are measured according to their length, width and depth. These diamonds will have a longer axis (the biggest measurement) and a shorter one that represents their width. The depth indicates the measurement of the diamond from the bottom to the top. The relative proportions of a diamond ultimately affect its quality and value.

Round-shaped diamonds are never perfectly round even though they may seem to be that way when you look at them. There is a tiny variation between maximum and minimum diameter, so dimensions are reflected as measurements of maximum diameter, minimum diameter and depth.

×
Call Now ButtonCall us today
Select your currency
USD United States (US) dollar