Trilogy Engagement Rings

Shape

There are 10 different shapes to choose from to suit every personality and style. The Round Brilliant continues to be the world’s most popular due to its fire, brilliance and classic look. If you are searching for something unique, opt for a fancy shape.

Round

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Princess

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Emerald

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Asscher

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Pear

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Radiant

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Oval

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Cushion

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Heart

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Marquise

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Carat

The size of a diamond is mainly influenced by its weight or carat (ct). Generally, the larger the carat weight the bigger the diamond. Carat is simply another unit of weight (where 1 carat is 0.2 grams).

Colour

This measure determines how much colour is in a diamond. It is considered better for the stone to have as little colour as possible so we recommend grade D to H for a whiter diamond.

The colour scale runs from D to Z, with D being the highest (whitest) grading. As you go down the scale toward Z the diamond develops a yellow or brown tint. The differences between D to G are barely visible to the naked eye but can offer 20 to 40% better value. For a yellow or rose gold setting, you can be more flexible and opt for a colour such as J as they metal colour ‘hides’ the color tint of the diamond.

Clarity

This grade measures the amount of imperfections in the diamond. We recommend you purchase an ‘eye clean’ diamond, meaning grade VS2 and above, where imperfections are not visible to the naked eye and would require magnification to be seen.

Flawless and Internally Flawless diamonds are extremely rare, so have premium prices. Although SI1 and SI2 are in general not eye-clean, the impurities may be light in colour or scattered and so in up to 20% of cases, SI1 graded diamonds may appear to be eye-clean. That number falls to just 5% for SI2s

Certificate

All our diamonds are independently certified from one of the world’s leading labs. Always ensure you are purchasing an independently certificated diamond to validate its quality, as many diamond retailers self-certify.

Above, we have listed the organisations in order of reliability and strictness. GIA is the most reliable certification body and sets the benchmark for the diamond industry. For example, HRD graded stones can appear to be about one colour grade lower than GIA and an EGL graded stone, can be up to four colour grades lower than GIA.

Price

Carat weight is one of the fundamental factors in determining the price of a diamond. Opting for a 0.90ct diamond can offer 10-20% better value than a 1ct diamond of the same quality and looks almost the same in size.

You do not need to select the highest quality to get something that is equally as beautiful. Colour G still looks white to the eye and can offer 20-40% better value than D. In most cases, there are no visible imperfections in VS2 diamonds and are priced lower than VVS2 upward. To the naked eye, there is little difference between very good and excellent cuts. Fancy shape diamonds also offer better value compared to round brilliants.

Cut

Often confused with a diamond shape, the cut actually determines how well the diamond sparkles. We recommend a cut grade of Excellent or Very Good as the sparkle for each grade looks similar to the naked eye.

The cut grading currently only applies to Round Brilliant diamonds as they are technically easier to measure in terms of light performance. Other shapes do not have an official cut grade, but 77 Diamonds provide an estimated cut grading based on equivalent parameters. An excellent cut grading will have the best light performance, mainly influenced by the relationship of surface table and the depth of the diamond (not too deep or too shallow).

Polish

This grade category indicates the overall condition of a finished diamond’s facet surfaces. We recommend a polish grading of Excellent or Very Good to ensure a smooth finish.

After a diamond is cut, each facet must be polished. The process can leave surface scratches or marks. If a diamond has no scratches or very minor ones, the polish is of a high degree. Scratches, lines, burn marks created by excessive heat, or rough girdles could downgrade the polish rating of a diamond.

Symmetry

This grade category considers the evenness of a diamond’s outline according to its shape category, as well as the placement and proportions of its facets. We recommend a symmetry grading of Excellent or Very Good to maximise sparkle.

When the facets of a diamond are well balanced and aligned, the stone has symmetry, which is critical to creating optimal brilliance and scintillation. Errors in symmetry include facets that are not properly aligned, improperly shaped facets, or an off-centre table reduce brilliance.

Fluorescence

Diamonds that are said to be fluorescent contain particles that emit a visible (usually blue) glow when exposed to UV lighting. None is considered the best, followed by Faint, Medium, Strong and Very Strong, we recommend None to Medium.

Very strong Strong Medium Faint None

In rare cases, high levels of fluorescence can make stones appear milky or hazy, although for the most part fluorescence does not generally impact beauty or sparkle and can even make some lower colours (I, J, K, L, etc.) appear more colourless or white. Nonetheless, fluorescent diamonds are usually cheaper and provided the effect is not readily visible may offer good value for money.

Ratio

The ratio denotes how the formation of a diamond's shape. A round diamond has a ratio of approximately 1, but the larger the ratio, the longer and thinner a diamond shape will become.