Every diamond carries a shape before it carries a story. That shape is the first thing you notice, the first thing you reach for, and often the reason a particular piece feels like yours the moment you see it.
But choosing a lab grown diamond shape is less about trends and more about knowing what you actually want on your hand, around your neck, or sitting in your ears every single day.
Most buyers spend surprisingly little time understanding how different diamond shapes actually behave once worn. And then they wonder why the piece they bought feels slightly off, even if it is technically beautiful.
This guide is here to change that. At Keemti, we design lab grown diamond jewellery for women who are deliberate about their choices. So before you fall in love with a shape on a screen, understand what it is, what it does with light, and whether it fits the life you are living.
Here is everything you need to know about lab grown diamond shapes, cut quality, and clarity, so you can choose with full confidence.
Why Shape Changes Everything
When we talk about lab grown diamond shapes, we are really talking about how a diamond is cut and faceted. Two diamonds of the same carat weight can look dramatically different depending on their shape.
Some spread wide across the finger, some sit deep and bold, some throw light in sharp flashes, and others glow with a softer, more open brilliance.
Shape is also a decision that cannot be changed later. Everything else, the metal, the setting, even the band, can be adjusted. The shape of your centre diamond is permanent. That is worth taking seriously.
Round Brilliant: Built for Maximum Light
The round lab diamond is the most purchased diamond shape in the world for a reason. It is designed for exceptional light return. With 57 to 58 carefully placed facets, each surface reflects light back through the top of the diamond. This creates the bright, crisp sparkle most people associate with a diamond.
If you want a piece that catches light from across a room, the round lab diamond is that piece. It is a classic shape but one of the most technically demanding to cut well, which is why cut grade matters more here than anywhere else. Always look for an Excellent or Ideal cut on your SGI and other certificates.
At Keemti, our round solitaires appear across the Classic and Essentials collections, in rings, studs, and pendants. The brilliance translates equally in a minimal everyday stud and in a more statement setting.
Best for: Everyday wear, solitaire rings, stud earrings, those who love high-contrast sparkle.
Oval Lab Grown Diamond: Elongated, Modern, and Larger Than It Looks
The oval lab grown diamond is one of the most sought-after shapes right now, and the reasons go beyond aesthetics. It carries the brilliant facet structure of a round diamond but in an elongated silhouette that behaves very differently in a setting.
The most practical advantage of an oval cut is its size perception. An oval of the same carat weight as a round will appear larger because of how the shape spreads across the finger. The length covers more surface area and creates a visual that feels generous without going up in carat or cost. For buyers who want presence within a defined budget, this matters.
There is one thing to know about the oval lab grown diamond before you commit: it can carry a shadow across the centre of the diamond called a bow tie. This is caused by light not returning through certain angles of the cut. A well-cut oval will have only a subtle bow tie, adding depth rather than distraction. A poorly cut oval will show a dark, distracting shadow. Always view an oval lab grown diamond in video or in person before purchasing, not just in a still image.
The oval works in solitaire rings, pendants, and earrings, and the elongated shape is particularly graceful in a drop earring setting.
Best for: Those who want a larger appearance per carat, a modern take on brilliant cuts, a finger-elongating effect in rings.
Emerald-Cut Lab Grown Diamond: Presence Over Sparkle
The emerald-cut lab grown diamond is a rectangle with cropped corners and what the trade calls step facets. Instead of small triangular facets that create flash, an emerald cut has long, parallel facets running down the diamond. The result is not sparkling in the traditional sense. It is depth. A hall of mirrors effect that reflects long, sweeping lines of light.
This shape prioritises sophistication over brilliance. It is architectural and restrained, with a visual presence very different from brilliant cuts. Rather than sparkling intensely, it reflects light in long, elegant flashes.
Because the facets are open and unobstructed, inclusions are significantly easier to spot in an emerald-cut lab grown diamond than in a brilliant-cut. If you are drawn to this shape, clarity becomes more important. VVS1 to VVS2 is the recommended range to keep the diamond looking clean and precise.
Best for: Women who prefer elegance over flash, centre stones in longer settings, pendants, drop earrings.
Cushion-Cut Lab Grown Diamond: Soft, Warm, and Deeply Wearable
The cushion-cut lab grown diamond has a square or rectangular outline with rounded corners and larger facets than a round brilliant. Those larger facets catch light in broader, chunkier flashes rather than tiny pinpoints of sparkle. The overall effect is warm, full, and romantic.
Cushion cuts carry a subtle vintage softness while still feeling entirely current in modern settings. In terms of clarity, VS1 to VS2 is a comfortable range for cushion-cuts, as the facet structure helps diffuse any minor inclusions.
At Keemti, cushion-cut designs appear in settings that highlight the soft geometry of the shape without overpowering it.
Best for: Everyday elegance, those who want something different from a round but equally wearable, vintage-inspired setting.
Princess Cut: Sharp Geometry, Brilliant Performance
The princess cut is a square diamond with sharp, uncut corners and a brilliant facet pattern similar to a round. It delivers a lot of sparkle in a modern, geometric form. The square silhouette feels current and clean, with none of the softness of a cushion.
Princess cuts tend to cost slightly less than rounds of the same carat weight because the cutting process retains more of the rough diamond. This often allows buyers to prioritise stronger cut or clarity grades within the same budget range.
One practical consideration: the four sharp corners of a princess cut are the most structurally vulnerable points of the diamond. A bezel setting or a four-prong setting that covers each corner is advisable for daily wear pieces.
Best for: Those who want brilliant sparkle in a square shape, modern and geometric aesthetic preferences.
Pear Cut: The Shape That Moves
The pear cut combines a rounded brilliant top with a pointed bottom tip, creating a teardrop silhouette. It is a hybrid cut that gives you the sparkle of a round brilliant in an asymmetric form that carries natural direction and movement.
Pear cuts are particularly striking as pendants and drop earrings because the pointed end creates a visual flow that suits long settings beautifully. In a ring, the traditional wear orientation is with the point facing the fingertip, which creates a lengthening effect on the hand similar to an oval lab grown diamond.
Best for: Pendants, drop earrings, and those who want movement and elongation in their design.
Cut Quality: The Number That Actually Matters Most
Regardless of shape, cut quality is the most important factor in how a diamond performs. A poorly cut diamond of excellent clarity will not look as beautiful as a well-cut diamond of moderate clarity. Cut determines how efficiently a diamond returns light, and light is what gives a diamond its character.
For round lab diamonds, IGI grades cut on a scale from Excellent to Poor. Always choose Excellent or Ideal.
For fancy shapes like oval, emerald, cushion, princess, and pear, there is no standardised cut grade on the certificate. This is why buying from a brand that selects diamonds for light performance matters as much as reading the numbers.
Key indicators to check:
-
Symmetry and polish graded Very Good or Excellent on the certificate
-
Table percentage between 54 and 60 for rounds
-
Depth percentage between 59 and 63 for rounds
-
For ovals and pears, request a video to assess the bow tie before purchasing
Clarity: What You Actually Need
Clarity refers to internal inclusions or surface blemishes in a diamond. Lab grown diamonds often have fewer inclusions than mined diamonds, but clarity still varies depending on the growth method.
For brilliant cuts (round, oval, cushion, princess, pear):
-
VS1 to VS2 is the best value range. These are eye-clean diamonds where no inclusions are visible without magnification.
-
SI1 to SI2 can also work for brilliant cuts. The sparkle pattern in these shapes helps mask minor inclusions effectively.
For step cuts (emerald cut):
Colour and Metal: How They Work Together
The colour grade of your diamond works in partnership with the metal setting.
-
White gold or platinum: Choose D to F (colourless) to keep the diamond looking bright and icy. The cool metal will amplify any warmth in a lower colour grade.
-
Yellow gold: G to J works very well. The warm metal tone complements a diamond with a slight warmth, and you save on the colour grade, freeing up budget for a better cut or clarity.
-
Rose gold: H to J pairs naturally and creates a cohesive, warm look throughout the piece.
Finding Your Shape at Keemti
Knowing your shape makes browsing far more intentional. Our Classic collection carries solitaire forward designs where the shape does the speaking.
The Essentials collection is built for daily wear, pieces that settle into your routine and stay. The Eternity and Fashion collection is for the moments you want to mark permanently.
Across rings, earrings, necklaces, and bracelets, each Keemti design is built around how a specific shape performs in light and how it sits on the body.
The oval lab grown diamond earring drops in the Classic collection are a strong example of how the elongated shape adds movement without effort. The round solitaire rings in Essentials are proof that the most technically brilliant shape is also the most enduring one.
Your Shape, Your Story
The right diamond shape is not the most popular one or the one trending on your feed this month. It is the one you keep coming back to when you scroll past everything else. The one that feels like a decision rather than a default.
At Keemti, we believe choosing your diamond is an act of self-understanding. A round lab diamond carries a sense of timeless brilliance. A cushion-cut lab grown diamond feels warm and romantic. An oval lab grown diamond brings softness with an elegant, elongated silhouette.
Every shape reflects something different about your style, your pace, and your journey. That choice deserves clarity, confidence, and jewellery that feels true to you.
