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Cubic Zirconia Anniversary Ring Band, Customer Designed Style 5183 Matching Band

Cubic Zirconia Anniversary Ring Band, Customer Designed Style 5183 Matching Band

From $740.02 USD
This "customer designed" product was designed with the help of one customer through our "Design Your Own" custom cubic zirconia jewelry program. Maybe you would you like our help bringing...
Cubic Zirconia Engagement Ring- Customer Designed Style 3631

Cubic Zirconia Engagement Ring- Customer Designed Style 3631

From $683.93 USD
This "customer designed" product was designed with the help of one customer through our "Design Your Own" custom cubic zirconia jewelry program. Maybe you would you like our help bringing...
Cubic Zirconia Engagement Ring- Customer Designed Style 5433

Cubic Zirconia Engagement Ring- Customer Designed Style 5433

From $1,740.30 USD
1 review
  Details Carat Weight: 2.5 Carat Center Stone, 2.69 Carat TCW* for the engagement ring; 0.875 Carat TCW for the matching band. Total carat weight for both rings together is...
Cubic Zirconia Engagement Ring- Customer Designed Style 5983

Cubic Zirconia Engagement Ring- Customer Designed Style 5983

From $866.74 USD
This "customer designed" product was designed with the help of one customer through our "Design Your Own" custom cubic zirconia jewelry program. Maybe you would you like our help bringing...
Cubic Zirconia Engagement Ring- The Aashi (Customizable Princess/Square Cut Design with Infinity-inspired Split Pavé Band and Bezel Peekaboo Accents)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Aashi (Customizable Princess/Square Cut Design with Infinity-inspired Split Pavé Band and Bezel Peekaboo Accents)

From $838.43 USD
Now here's a name that you won't often hear! Aashi is a short yet unique name that means 'smile' in the Sanskrit language. What can be better than a life...
Cubic Zirconia Engagement Ring- The Abbey Ro (Customizable Princess/Square Cut Solitaire with 'Incomplete' Decorations)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Abbey Ro (Customizable Princess/Square Cut Solitaire with 'Incomplete' Decorations)

From $262.14 USD
We initially hesitated to sell The Abbey Ro without an anniversary band. An early focus group member looked at the spec ring design and said "It's a pretty ring, but...
Cubic Zirconia Engagement Ring- The Adamari (Customizable 7-stone Princess Cut Style with Round Bar-set Accents)
0.40 Carat0.50 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat3.50 Carat5.00 Carat0.65 Carat

Cubic Zirconia Engagement Ring- The Adamari (Customizable 7-stone Princess Cut Style with Round Bar-set Accents)

From $301.68 USD
Have you ever said you’ll do something someday? ‘Someday’ is not a day of the week, says the mirror-reversed ink inscription tattooed on the abdominal muscles of a man hell-bent...
Cubic Zirconia Engagement Ring- The Adelaide (Customizable Princess/Square Cut Cathedral Solitaire with Two-Tone Option Decorative Trellis 'Down Under')
0.40 Carat0.50 Carat0.65 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat

Cubic Zirconia Engagement Ring- The Adelaide (Customizable Princess/Square Cut Cathedral Solitaire with Two-Tone Option Decorative Trellis 'Down Under')

From $238.56 USD
  We first made The Adelaide engagement ring for a free-spirited woman from "Down Under". A woman who was easily misunderstood. Look from above and you'll see little more than...
Cubic Zirconia Engagement Ring- The Adele (Customizable 7-stone Princess/Square Cut Design with Tri-Cluster Accents and Teardrop Fleur-de-lis Motif)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Adele (Customizable 7-stone Princess/Square Cut Design with Tri-Cluster Accents and Teardrop Fleur-de-lis Motif)

From $325.92 USD
  Hello, dear reader. Mr. Cubic Zirconia here to write this product description today...I hope you won't give me the cold shoulder; please permit me a moment of your time...
Cubic Zirconia Engagement Ring- The Alana Marie (Customizable 3-stone Cathedral Princess/Square Cut Design with Twin Asscher Cut Side Stones)
0.65 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat

Cubic Zirconia Engagement Ring- The Alana Marie (Customizable 3-stone Cathedral Princess/Square Cut Design with Twin Asscher Cut Side Stones)

From $352.88 USD
"Give me your forever" says The Alana Marie ring from CubicZirconia.com. This 3-stone, heirloom-quality stunner glitters in 4.33 mm* wide-banded glory crafted carefully of yellow gold, rose gold, white gold,...
Cubic Zirconia Engagement Ring- The Amariah (Customizable 3-stone Princess/Square Cut Design with Twin Petite Round Accents)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Amariah (Customizable 3-stone Princess/Square Cut Design with Twin Petite Round Accents)

From $307.25 USD
    "I always told her she could do whatever she set her mind to doing. I didn't really think she'd do the impossible, though." -- her grandfather. "She's the...
Cubic Zirconia Engagement Ring- The Amice (Customizable Vintage 5-stone Design with Princess/Square Cut Center and Artistic Band Décor)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Amice (Customizable Vintage 5-stone Design with Princess/Square Cut Center and Artistic Band Décor)

From $310.63 USD
Slim, sexy, and maybe a little bit sassy? Yeah, we're talking about you-know-who...isn't she a bona-fide beauty with a hint of French-model attitude and pouty, infinitely kissable lips? If that...
Cubic Zirconia Engagement Ring- The Ann Michelle (Customizable Cathedral-Bezel Princess/Square Cut 7-stone "Semi-Solitaire" Design)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Ann Michelle (Customizable Cathedral-Bezel Princess/Square Cut 7-stone "Semi-Solitaire" Design)

From $361.88 USD
"Marital material." Time Magazine. "Makes mama proud." Cosmopolitan. "Sexy, stylish and smart: 5 stars." Elle. The blurbs are in, and we have a winner. Is the winner the woman you're...
Cubic Zirconia Engagement Ring- The Araceli (Customizable Bezel-set Princess/Square Cut Design with Cloud-pattern Band & Semi-Eternity Accents)
0.65 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat

Cubic Zirconia Engagement Ring- The Araceli (Customizable Bezel-set Princess/Square Cut Design with Cloud-pattern Band & Semi-Eternity Accents)

From $421.66 USD
The Araceli from CubicZirconia.com is more than just a ring to the woman destined to show it off. More than just a ring, it's a gift that embodies the powerful...
Cubic Zirconia Engagement Ring- The Ashton (Customizable Vintage Princess/Square Cut Design with Beaded Milgrain and Starburst Semi-Halo)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Ashton (Customizable Vintage Princess/Square Cut Design with Beaded Milgrain and Starburst Semi-Halo)

From $342.35 USD
A hush falls as the house lights slowly dim. She comes through the heavy oaken doors, gliding down the center audience aisle with all the coolness of a swan ice...
Cubic Zirconia Engagement Ring- The Brynhild (Customizable Engraved Design with Princess/Square Cut Center and Perpendicular Band Accents)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Brynhild (Customizable Engraved Design with Princess/Square Cut Center and Perpendicular Band Accents)

From $285.91 USD
There's a certain forbidding beauty to this Princess/Square Cut ring that simply doesn't require a black latex boot on your neck to recognize. And certainly not twice. Yes, mistress! She'll...
Cubic Zirconia Engagement Ring- The Carli Love (Customizable Princess/Square Cut Style featuring Milgrained Shared Prong Band & Dual Peekaboos)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Carli Love (Customizable Princess/Square Cut Style featuring Milgrained Shared Prong Band & Dual Peekaboos)

From $516.34 USD
You're not a woman who likes to be told not to do something you want to do, because it's an exhilarating feeling when you make the right choice for what...
Cubic Zirconia Engagement Ring- The Cecelia (Customizable Princess/Square Cut Setting with Halo, Under-Halo Trellis Accents and Accented Split Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Cecelia (Customizable Princess/Square Cut Setting with Halo, Under-Halo Trellis Accents and Accented Split Band)

From $474.16 USD
  It's bound to happen. She's walking along wearing this double-banded beauty and cue the double-take machine. Necks aren't twisting just because you had the great taste to choose an...
Cubic Zirconia Engagement Ring- The Cheyenne (Customizable Bezel-set Princess/Square Cut Solitaire with Beaded and Carved Three-sided Band)
0.65 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat

Cubic Zirconia Engagement Ring- The Cheyenne (Customizable Bezel-set Princess/Square Cut Solitaire with Beaded and Carved Three-sided Band)

From $243.88 USD
One of our customers stated that The Cheyenne's beaded and carved band has a very Native-American flavor, and the person who named this ring agreed. Exquisite in every way, this diamond-quality...
Cubic Zirconia Engagement Ring- The Cielo (Customizable Cathedral-Raised Princess/Square Cut Halo Style)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Cielo (Customizable Cathedral-Raised Princess/Square Cut Halo Style)

From $499.53 USD
Do you and your 'amor' love looking at the stars as you enjoy each other's company? Does she uplift you with her very presence? Can you see the future happiness...
Cubic Zirconia Engagement Ring- The Crissy (Customizable Princess/Square Cut Solitaire with Decorative Prongs & Tapered Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Crissy (Customizable Princess/Square Cut Solitaire with Decorative Prongs & Tapered Band)

From $266.84 USD
You probably don't want to know exactly how much you'd pay for the 5.0 carat, flawless and colorless mined natural-diamond version of this solitaire engagement ring. Plenty of 3 bedroom/2...
Cubic Zirconia Engagement Ring- The Diamond (Customizable Princess/Square Cut Solitaire with Braided Infinity-inspired Band and Fancy Basket)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Diamond (Customizable Princess/Square Cut Solitaire with Braided Infinity-inspired Band and Fancy Basket)

From $266.41 USD
  We're willing to bet on you. And on that smile of hers being big when she receives this infinity-inspired, braided-metal band with decorative trellis and fancy center setting basket.*...
Cubic Zirconia Engagement Ring- The Eleonora (Customizable Princess/Square Cut Solitaire Design with Tapered Infinity-symbol Split-band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Eleonora (Customizable Princess/Square Cut Solitaire Design with Tapered Infinity-symbol Split-band)

From $259.57 USD
Want to hear the truth? You deserve a man who calls you 'baby', kisses you like he means it and will hold you like he never wants to let you...
Cubic Zirconia Engagement Ring- The Eowyn (Customizable Vintage Artisan Princess/Square Cut Design with 3-Sided Filigree and Side Inlay Accent Enhancements)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Eowyn (Customizable Vintage Artisan Princess/Square Cut Design with 3-Sided Filigree and Side Inlay Accent Enhancements)

From $367.31 USD
Would you describe her as strong and yet delicate? Is she skilled at taking care of those around her, but not afraid to fight when needed? Noble and graceful in...
Cubic Zirconia Engagement Ring- The Eternity (Customizable Princess/Square Cut Design featuring 3-Sided Infinity Trellis and Round-Channel Accented Band)
0.50 Carat0.65 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat

Cubic Zirconia Engagement Ring- The Eternity (Customizable Princess/Square Cut Design featuring 3-Sided Infinity Trellis and Round-Channel Accented Band)

From $371.93 USD
  Forever just may not be long enough to admire her, nor for her to admire her special ring. But every 'forever' starts with a today. You ready? If so,...
Cubic Zirconia Engagement Ring- The Fabiola (Customizable Cathedral-raised Princess/Square Cut Design featuring Rope-Braided Half-Pavé Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Fabiola (Customizable Cathedral-raised Princess/Square Cut Design featuring Rope-Braided Half-Pavé Band)

From $320.09 USD
The Fabiola will twist around your beloved's finger, intertwining in its braided-rope style band design a lasting reminder of your love and devotion. Love knots were the inspiration for this...
Cubic Zirconia Engagement Ring- The Farrah Michelle (Customizable Princess/Square Cut Style with Halo and Sculptural Trellis)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Farrah Michelle (Customizable Princess/Square Cut Style with Halo and Sculptural Trellis)

From $570.13 USD
There will always be opportunities that come your way that you know are wrong for you and, while it can be difficult, you can learn to turn these opportunities away....
Cubic Zirconia Engagement Ring- The Hé Zhang (Customizable Princess/Square Cut Design with Floral Segmented Halo & Sculptural Basket)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Hé Zhang (Customizable Princess/Square Cut Design with Floral Segmented Halo & Sculptural Basket)

From $306.87 USD
  Imagine vines growing along a garden wall as a sparkling waterfall trickles with soft susurration down into a tranquil koi pond dappled with water lilies. The sun smiles and...
Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Princess/Square Cut Style featuring Peekaboo Trellis Hidden Stones)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Princess/Square Cut Style featuring Peekaboo Trellis Hidden Stones)

From $296.86 USD
Sometimes a woman may do things for attention. And sometimes more attention is the last thing you want or need! Introducing The Heilanda engagement ring: an artisan-inspired, 3-sided, ultra-thin-banded ring...
Cubic Zirconia Engagement Ring- The Honesty (Customizable Cathedral-Halo Princess/Square Cut Style featuring Sculptural Trellis)
0.50 Carat0.65 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat

Cubic Zirconia Engagement Ring- The Honesty (Customizable Cathedral-Halo Princess/Square Cut Style featuring Sculptural Trellis)

From $470.51 USD
  Every time someone orders from our company, our goal is to produce the honest-to-God best, heirloom-quality cubic zirconia jewelry with precious metals commercially available on the planet. Our philosophy...
Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Princess/Square Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Princess/Square Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)

From $505.83 USD
Some people think it takes a lot of effort to dominate a room. Yet catching the eye is half the work already done. The Honoka is a prong-set 5A diamond-quality...
Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Princess/Square Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Princess/Square Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)

From $562.79 USD
Aloha! This happenin' enhanced three-stone ring is cooler than a grass skirt on a windy day. A 5A diamond-quality Princess/Square cut cubic zirconia center stone sits pretty in a prong...
Cubic Zirconia Engagement Ring- The Jada (Customizable Cathedral-Bezel Princess/Square Cut Design with Under Halo and Shared Prong Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Jada (Customizable Cathedral-Bezel Princess/Square Cut Design with Under Halo and Shared Prong Band)

From $740.66 USD
Warning: may be threatening to weak men. That's not simply an "under halo" of round accent stones running horizontally underneath the raised cathedral-style center setting of this artisan engagement ring....
Cubic Zirconia Engagement Ring- The Jisha (Customizable Triple Princess/Square Cut Design with Thin Band)
0.20 Carat0.23 Carat0.30 Carat0.40 Carat0.50 Carat0.65 Carat0.75 Carat1.00 Carat

Cubic Zirconia Engagement Ring- The Jisha (Customizable Triple Princess/Square Cut Design with Thin Band)

From $150.25 USD
This ring was named for our favorite drama queen, whose real name was not used to protect her feelings. Or rather, more accurately, we instead chose the name "Jisha" to...
Cubic Zirconia Engagement Ring- The Josemaria (Customizable Vertical 3-stone Princess/Square Cut Design Enhanced with Multi-Halo Accents and Twisted Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Josemaria (Customizable Vertical 3-stone Princess/Square Cut Design Enhanced with Multi-Halo Accents and Twisted Band)

From $449.77 USD
The Josemaria ring design from CubicZirconia.com is alive with symbolism. There are three (3) primary stones in the design-- one large Princess/Square cut center stone in the size of your...
Cubic Zirconia Engagement Ring- The Josepha (Customizable Cathedral-style Princess/Square Cut Solitaire with Decorative Heart Prong Basket)
0.65 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat

Cubic Zirconia Engagement Ring- The Josepha (Customizable Cathedral-style Princess/Square Cut Solitaire with Decorative Heart Prong Basket)

From $240.07 USD
Life can be tough, at times. We wonder and worry, often working ourselves into a tizzy over this or that. Often, it comes down to a fear of how we...
Cubic Zirconia Engagement Ring- The Kaipo (Customizable 7-stone Princess/Square Cut Style with Triple Round-Bezel Accent Cluster Each Side)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Kaipo (Customizable 7-stone Princess/Square Cut Style with Triple Round-Bezel Accent Cluster Each Side)

From $389.87 USD
Be sure you slide this extraordinary 7-stone 5A diamond-quality cubic zirconia engagement ring on the finger of an extraordinary woman, because that's who this lil' sweetheart was made for. It...
Cubic Zirconia Engagement Ring- The Leontine (Customizable Princess/Square Cut Design with Split Band and "Lion's Mane" Halo)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Leontine (Customizable Princess/Square Cut Design with Split Band and "Lion's Mane" Halo)

From $382.06 USD
As a grandfather once told a teenage boy**: "A real live Barbie might be fun for a weekend if you're young, but after that there's not much to it but...
Cubic Zirconia Engagement Ring- The Libia (Customizable Triple Princess/Square Cut Design)
0.07 Carat0.10 Carat0.14 Carat0.17 Carat0.20 Carat0.23 Carat0.30 Carat0.40 Carat

Cubic Zirconia Engagement Ring- The Libia (Customizable Triple Princess/Square Cut Design)

From $280.72 USD
Modesty becomes you when you select this best-selling ring design from CubicZirconia.com. This triple Princess/Square cut cubic zirconia ring can be given as an engagement ring. And with triple the...
Cubic Zirconia Engagement Ring- The Makayla Belle (Customizable 3-stone Design with Princess/Square Cut Center and Halo Enhancement)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Makayla Belle (Customizable 3-stone Design with Princess/Square Cut Center and Halo Enhancement)

From $297.30 USD
Flowers are pink and yellow, and her dress is white. He watches her walk towards him, and the music isn't just in her head this time. He looks to the...

princess square cut cubic zirconia stonesPrincess cut cubic zirconia loose gemstones-- single or wholesale in bulk-- plus rings, earrings, and pendants set with this perennial favorite CZ gemstone cut!  Each princess cut CZ loose stone is shipped to you in a secure, velvet-lined gift box. All loose stones packages ship from the United States, typically within two business days of confirmed purchase. 

--split--

Princess Cut Cubic Zirconia Jewelry, Rings, Earrings, and Loose Stones

When you’re shopping for loose CZ stones on CubicZirconia.com, know that we use carat-equivalent sizes.  That means that when you buy a 2 carat Cubic Zirconia, we match up the size dimensions for a perfect 2 carat diamond and make sure you get a match in size measured in millimeters.  For example, in Princess cut that would be a 7.5 mm CZ stone, or a two-carat princess cut diamond equivalent.  

If you need help figuring out what size your stone is, use our mm/carat comparison chart

Our flawless selection of the finest AAAAA (5A) diamond-quality CZ loose stones are made to sparkle in any setting. Looking for cubic zirconia jewelry set with princess cut CZ gemstones? Click here for our full product catalog of princess cut cz jewelry!

Looking for a custom ring designed with this Princess Cut center stone? Click here for a custom quote

If you need help figuring out what size your stone is, use our mm/carat comparison chart