Lab-grown diamonds are diamonds that have been created in a laboratory. At this point, scientists have developed five different types of lab-grown diamonds shapes: round, cushion, pear, marquise, and oval. These Lab-Grown Diamond Shape cuts are based on traditional cuts for natural mined diamonds.
A brilliant round cut is the most popular Lab-grown diamond shape with a 74% market share. It’s easy to see why! The brilliance of an ideal cut is evident when looking at it from any angle. As you can see in the graphic above, numerous internal facets help create the fiery white light effect when seen under normal lighting conditions. Many people think this shape resembles a teardrop due to its high crown and low pavilion. However, the round shape of the diamond is perfectly symmetrical and can have a different appearance depending on how it’s viewed.
A cushion-cut diamond is an antique-inspired gemstone created for those who love vintage jewelry. This beautiful gemstone was initially used as engagement rings by older civilizations such as Egyptians and Greeks. Cushion-cut diamonds are some of the oldest cuts still available today! Cushion-cut diamonds look similar to radiant-cut diamonds, but they possess more sparkle because there are fewer facets in the pavilion. This, along with the cushion cut that lends itself to deeper levels of color tones and contrasts, is what makes this diamond so distinct.
A Pear-shaped diamond looks like a teardrop! There are many different variations of the pear-shaped cut; some are more symmetrical than others. The distinguishing feature behind all pear shape diamonds is that they possess very pointed tips on both ends of the “drop.” Many people like this gemstone because it can make them feel either elegant or edgy, depending upon which metal/band combination is used to set the gemstones in place.
A marquise diamond is an elongated variation of a round brilliant cut diamond. This stone has 57 facets (counting both the crown and pavilion). If you consider getting a marquise cut diamond, make sure you know the “bow-tie effect.” This means that when you look at this gemstone from the top half, the bottom half looks slightly dark. This is caused by light leakage. The bow-tie effect can be minimized by setting this shape in a pronged solitaire ring with an invisible-style setting (for example).
Oval diamonds were created to showcase large cut stones within classic engagement rings. These diamonds usually have 67 facets (crown and pavilion) which create many opportunities for light reflection inside the stone. Oval diamonds are similar to princess-cut diamonds, but they possess more brilliance and fire. Princess cuts are similar to an oblong octagon (not quite as long as a marquise diamond) and tend to lose their “princess” shape when worn in many other styles of rings. This is because princess-cut diamonds are most secure when set within solitaire settings. An oval diamond can be set in multiple different engagement ring styles, making them more versatile than the princess cut diamond.
The best way to understand the different Lab-grown diamond cut styles is by seeing them in person. The pictures shown above are long, so it can be a challenge to see all of the small details that make these beautiful gemstones unique from one another. The size of the diamond is represented by the number on the left, while its length is measured by inches.
| Diamond (By Number) | Length (By Inch) |
| 0.00-1 1/2 | 5/8 inch |
| 1 3/4 – 1 5/8 | 3/4 inch |
| 2 1 8 – 2 1 6 | 7/8 inch |
| 3 3 4 – 3 7 8 | 1 27⁄32 inches |
| 4 1 27⁄32 – 4 1 5/8 | 1 25⁄32 inches |
| 5 7 8 – 5 7 2 | 1 3/8 inches |
| 6 9 10 – 6 15 16 | 1 13⁄16 inch (D) |
| 7 3 4 – 7 17 | 2 1⁄16 inches (E) |
| 8 20 24 | 2 1⁄4 inches (H) |
| 9 30 | 2 9⁄16 inches (K) |
| 10 45 | 3 11⁄16 inches (O, Q) |
| 11 60 | 3 13/16 inch (SS, ZZ, QR, WUY) |
| 12 75 80 | 4 25/32″ (Y) |
| 13 90 | 4 1/2 inches (M, EX, JX, etc.) |
| 14 105 | 4 9⁄16 inches (P) |
| 15 120 | 4 13/16 inches (T, ZN) |
| 16 135 150 185 210 | 5 1/32″ (TT, ZR, CR, etc.) |
(All sizes larger than this should be considered as Custom Sizes and priced accordingly. Diamonds over 315 carats in weight are seldom set as a solitaire and are usually incorporated into a piece of jewelry such as a necklace or bracelet).
Note: **This chart applies to the United States; other countries may have different standards for measuring diamond size. **
Lab-Grown Diamond Shape & Cut Chart – Round, Asscher, Radiant, Cushion Charts for Lab Grown Diamonds in the United States
The price will be based on size, cut, color and clarity.
- Round:
Excellent (IF), Very Good (VVS1, VVS2), Good (VS1, VS2), Fair (SI1), or Poor (I1, I2).
- Princess:
Excellent to Very Good.
- Cushion:
Excellent to Very Good.
- Oval/Marquise/Pear:
Excellent to Very Good. Prices are based on the diamond’s cut.
- Heart:
Excellent (IF) to Fair (I3). Price is based on the diamond’s cut.
- Radiant:
Slightly included. Price is based on the diamond’s size and color.
- Asscher:
Slightly included; Often a lower quality Asscher will have double claws rather than triple claws and their symmetry can be less perfect. Price is based on the diamond’s cut, color, and clarity/clarity enhancement.
- Trilliant:
Very slightly included. Price is based on the diamond’s size, cut, color, clarity/clarity enhancement. This chart applies to diamonds within 5 carats of 2 carats or larger. Diamonds are measured by weight in carats 1/5 of a point. The price will be based on size, cut, color and clarity.R
In conclusion:
Round brilliant lab-grown diamond shapes are 74% of the market share because they have higher light reflection and refraction. Oval, marquise, and pear-shaped diamonds you should consider if you want something unique and sparkly! They offer more variety than round-shaped stones. Cushion diamonds are excellent if you like vintage jewelry designs with less light leakage (bow-tie effect). Â Princess cuts lose their “princess” shape when set in other types of rings; oval diamond shapes maintain their “oval” shape in different engagement ring styles. Enjoy! This is an interactive article. Click the links to get more information on each cut style mentioned above. Thank you for reading!
