Buying Guide

Ring Sizing:

The most accurate way to determine your ring size is to have a jeweller size your finger for you.  If this is not an option for you, it is possible to get a rough size of your finger with a paper guide.  

­ Click here to view our printable ring sizing guide 
Note: in order to print an accurate guide, click the "save" button in the bottom right corner of the page and save the file to your desktop.  Open the file and click "print".  Be sure that you are printing the pdf at 100% (i.e: page scaling is set to "none"). 

Your ring should fit your finger comfortably; loose enough to slide over your knuckle and snug enough to fit closely to your finger without moving or twisting too much.

You finger size will vary depending on the time of day and the temperature of your hands. Your fingers will be smaller in the morning and when your hands are cold.  Finger size will also very between your left and right hands (i.e. the ring finger on your left hand is not necessarily the same size as the ring finger on your right hand). Be sure to take a few measurements to get an average reading.

Diamond Tutorial:

We, at JayLyn Jewellers, wish to dedicate this diamond tutorial to those of you who share our interest in excellent cut and the highest quality of craftsmanship used to perfect any diamond cut by our master cutters. Factual information is necessary for those investing in diamonds and fine quality jewellery so you can purchase with an education of the basics of diamond characteristics. Our aim is to contribute to this knowledge in order to foster a healthy environment of integrity and honesty, which are the core values of our staff here at JayLyn Jewellers.



The Four C's


Cut is the most important of the Four C's.


Colourless diamonds are rare and considered most desirable.


A flawless diamond has no visible inclusions.


This is the term used to designate the unit weight of a diamond.



An Ideal Cut Stone

The cut of a diamond determines its brilliance or sparkle. Each shape will be cut differently. Before a diamond is cut, the location of inclusions and flaws, the natural coloration, and the original shape of the rough stone are studied extensively. The stone facets are then mapped out and cut in a way that maximizes size, shape, and clarity. For optimal light performance, you will want a diamond that is cut neither too shallow nor too deep, like the stones that JayLyn Jewellers offers.

When a diamond is cut too shallow, light leaks out of the bottom, brilliance is lost and the diamond appears watery, glassy and dark.
When a diamond is cut too deep, light leaks out of the bottom, brilliance is lost and the center of the diamond will appear to be dark.
When a diamond is cut to Ideal proportions, all of the light entering from any direction is totally reflected through the top and is dispersed into a display of sparkling flashes and a rainbow of colours.



Stone Color

Diamonds range from colourless, being the rarest and most valuable, to yellowish with a spectrum of shades in between. As these yellowish tones become more apparent, the rarity and cost of the diamond decrease. However, when a diamond's colour is more intense than the "Z" grading, it enters the realm of "Fancy Colour". In this case, the intensity of the colour in the diamond plays a major role in its value. The value of a Fancy Colour Diamond may far surpass that of colourless diamonds if the intensity of the colour is high and the colour is rare. A diamond may come in all colours of the rainbow. While the prices are higher for colourless diamonds, the most valued colour is a matter of personal preference. Some prefer the very transparent D-F range, while others may opt for the "warmer" colors in the G-J range or diamonds with a clearly visible tint. The charts below represent these colour variations and their respective GIA grades and traditional terms. 



Diamond Clarity

Most diamonds contain naturally occurring internal characteristics called inclusions. Inclusions are internal features which are wholly or partially surrounded by the stone, for instance, crystalline and solid inclusions, dot-like inclusions, clouds, cracks [cleavage, fracture and tension cracks], feathers and structural phenomena.

Only a very small percentage could be classified as flawless. The size, nature, location and number of inclusions determine a diamond's clarity grade and affect its value. A flawless diamond has no visible inclusions under 10X [poser] magnification. Below are representations of the different degrees of clarity grades in diamonds.

  • FL-IF: No inclusions visible under 10x magnification.
  • VVS1-2: Minute - extremely difficult to find under 10x.
  • VS1-2: Minor - difficult to find under 10x.
  • SI1-2: Noticeable, easy to find under 10x.
  • I1-I2: Obvious under 10x - Visible to the naked eye.



Carat Weight

Besides colour, clarity and cut, carat weight provides a further basis in the valuation of a diamond. The weight of all gemstones is measured in carats. There are 142 carats to an ounce. Each carat contains 100 points.

5 carat= 1.00 gram
1 carat = 1.00 [100 points]
1/2 carat = 0.50 [50 points]

The weight of a diamond is to be indicated to the second decimal point. The international abbreviation is - ct. Diamond weight is determined by an extremely sensitive scale or diamond balance. It is possible to determine a round brilliant cut diamond's weight by measuring its proportions. This latter method is not nearly as accurate as using a proper scale.

Calculating the Weight of Diamonds:

Within certain tolerances, the brilliant is a standardized form of cut polished with certain well established sizes of facets and angles, so there is a definite relationship between weight and size of a brilliant. It is therefore possible to estimate the size of a brilliant from its weight and vice versa. This also applies to the fancy cuts.
The standardized forms of cut and the relative constant specific gravity of 3.52 enable one to calculate the weight of a diamond by establishing the volume.
With today's usual brilliant cut with flat crown, fine girdle and a total height of 58-62%, the following formula is used:

Carat weight = height x diameter [squared] x 0.0061

Girdle diameter - 10.0mm
Total height - 6.0mm
Carat weight = 6.0 x 10.0[squared] x 0.0061 = 3.66ct.