Valuing Diamonds

How Do We Value Diamonds?Clinton grading diamonds

We only purchase diamonds with the following grading:

SI2 clarity or better
H Colour or better

If you have a GIA certified appraisal of your jewellery, you can expect to receive from 15% – 30% of the appraised value of your jewellery.

Why do I only receive that value for my jewellery?

As you know the appraisal you received for your jewellery was at least 50% higher than what you paid for your jewellery. Let’s say that you purchased a diamond ring for $2500.00 from a reputable jewellery store. The appraisal you received was for $5500.00. The jeweller’s cost on that ring was around $1250.00. We would pay you 50 – 75% of the cost value as it is a used piece. Most jewellery we buy is manufactured into new jewellery.

Diamond Grading Information

Diamond size chart – View as PDF

Diamond chartDiamond sizes are often difficult to find. Many diamond size charts are not always accurate, and diamonds sizes can vary depending on how the diamond is cut. The size of the diamond is often referred to as the spread of the stone. A good spread on a diamond often means it is a large size in comparison to the weight.

Certain cuts, even in round diamonds, can produce unexpected weights. For example, in some Victorian or European Old Mine cuts, it is common to find a much thicker make of diamond. Diamonds cut fairly deep will exhibit less diameter for the specified weight. For example, a 0.25cts stone might only weigh 3.7mm, similar to a well-cut 0.20cts diamond. Knowing the correct size will enable you to judge whether the diamond is correctly sized. For example, a carat diamond ring with a single round diamond should ideally have a diamond diameter of 6.4-6.5mm.

Diamond size is not to be confused with diamond weight. Diamond size refers to the mm size of the stone. Typically on certificates, the stone is measured along the length, width and depth of the diamond. Here, we offer a basic guide, with the main measurement being listed. This will offer you an idea of the size of the stone. Some diamonds weigh heavier due to the style of cut. Emerald cut diamonds for example are fairly thick step cut diamonds and tend to have a lot of weight in the back of the stone. Other stones such as trilliants can be fairly shallow and the size of the stone can often be larger than you would expect for the weight.

Princess cuts, one of the most popular cuts, have diamond sizes that are heavier than rounds which must always be remembered. There is no real rule of thumb to diamond sizes, and it is only from dealing with the stones over a period of time that the approximate sizes are easily remembered. This is always useful when particular ring mounts take particular diamond sizes. This sort of knowledge we find essential at Serendipity Diamonds, to provide prompt information to customers when they contact us.

Looking for loose diamonds? – Email us for any size, shape, colour or clarity of diamond required. Loose diamond orders are welcomed.