Jewelry Guide

Size Guides

Find your perfect fit.

Rings

Chains and Necklaces

Bracelets

Rings

Ring Size Guide

How to measure your ring size at home.

1. Measure an existing ring

Select an existing ring that fits your desired finger and measure the internal diameter in mm. Use our Ring Conversion Size Chart below to determine your Koru ring size.

2. Measure your finger

Wrap a strip of paper or thread around your desired finger, leaving enough space to slide the ring over your knuckle. Mark the place where the ends meet with a pen. Place on a flat surface and measure the length of your finger with a ruler. Use our Ring Conversion Size Chart below to determine your Koru ring size.

3. Measure your finger using the PerfectFit App

Download the PerfectFit App to your smartphone or tablet. Watch our
tutorial or follow the instructions on the screen. Use the virtual ring
sizer to determine your Koru ring size.

Tips, Tricks and Things to consider.

  • Measure your fingers at the end of the day, when they are the largest.
  • Your fingers can lose up to half a size in cold weather. Heat and water retention caused by food, cocktails or medication may cause fingers to swell up.
  • Your dominant hand's fingers are larger than those of your non-dominant hand.
  • If you fall in between sizes, choose the larger size.
  • The fit on your finger will vary depending on the ring design.
  • Thick band rings generally fit tighter; go up half a size for a comfortable fit. Pick a snug-fitting size when buying slim stacker rings.

Need 1-on-1 assistance?

Allow Koru Jewelers to help you find a ring, bracelet or necklace in your perfect size. Please contact our Concierge with any questions or to speak with someone who can advise you on finding your best fit.

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Chains and Necklaces

Chains and Necklaces Size Guide

How to find your chain and necklace length.

1. Use your neck circumference

Your neck circumference will influence how your necklace sits alone and/or alongside other styles. Standing before a mirror, wrap a flexible measuring tape around your neck joining both ends at the length of your preference. Consider the size and shape of the necklace, chain or pendant that you’re eyeing. Reference our Chain & Necklace Size Chart to the right to determine your perfect Koru necklace length.

2. Use your favorite necklace

Grab our favorite necklace and place it open on a flat surface. Measure
from the outer edge of the clasp to the other end of the necklace using
a ruler. Consider the size and shape of the necklace, chain or pendant
that you’re eyeing. Reference our Chain & Necklace Size Chart to the right
to determine your perfect Koru necklace length.

Tips, Tricks and Things to consider.

  • Finding the right balance is the key to chain and necklace layering.
  • For a chain pendant look, consider the total length of the chain plus the length of the pendant.
  • Our chains vary between 14 inches (36 cm) and 32 inches (81 cm). You can always add an additional 2 inches with our chain extenders.

Need 1-on-1 assistance?

Allow Koru Jewelers to help you find a ring, bracelet or necklace in your perfect size. Please contact our Concierge with any questions or to speak with someone who can advise you on finding your best fit.

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Bracelets

Bracelets Size Guide

How to find your bracelet size.

1. Measure your wrist

Wrap a tape measure, strip of paper or thread around the wrist on which you plan to wear your bracelet, and mark the place where the two ends meet in mm. Consider the style and width of the bracelet that you’re eyeing. Refer to our Bracelet Size Chart below to match the measurement to the most suitable Koru bracelet size for your wrist.

2. Check the length of your favorite bracelet

Grab our favorite bracelet and place it open on a flat surface. Measure from the outer edge of the clasp to the other end of the bracelet in mm using a ruler. Consider the style and width of the bracelet that you’re eyeing. Refer to our Bracelet Size Chart below to match the measurement to the most suitable Koru bracelet size for your wrist.

Tips, Tricks and Things to consider.

  • Round your measurement to the nearest centimeter.
  • Bracelet sizes and fit will vary depending on its finish and design.
  • Order your regular size in chain bracelets to allow for movement. For cuffs, we recommend ordering a size down to fit snugly around your wrist.

Need 1-on-1 assistance?

Allow Koru Jewelers to help you find a ring, bracelet or necklace in your perfect size. Please contact our Concierge with any questions or to speak with someone who can advise you on finding your best fit.

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Ring Conversion Size Chart

Ring Diameter International Conversion
mm US EU
42.9 3 44.2
45.5 3.5 45.5
46.8 4 46.8
48.0 4.5 48
49.3 5 49.3
50.6 5.5 50.6
51.9 6 51.9
53.1 6.5 53.1
54.4 7 54.4
55.7 7.5 55.7
57.0 8 3
Ring Diameter International Conversion
mm US EU
58.3 8.5 58.3
59.5 9 59.5
60.8 9.5 60.8
62.1 10 62.1
63.4 10.5 63.4
64.6 11 64.6
65.9 11.5 65.9
67.2 12 67.2
68.5 12.5 68.5
69.7 13 69.7

Bracelet Size Chart

Bracelets Wrist Measurement
mm US EU
X-Small 4.76-5.25 121-133
Small 5.26-5.75 134-146
Medium 5.76-6.25 146-159
Large 6.26-6.75 159-171
X-Large 6.76-7.25 172-184
XX-Large 7.26-7.75 197-210

Gold Guide

The most malleable of all precious metals, gold is ideal for crafting designs that last a lifetime.

Gold Alloys

Karat

Buying Tips

Gold Alloys

Gold Alloys

Alloys are made by combining two or more metals to improve their strength and corrosion resistance. Every component determines an alloy's properties and color.

Yellow Gold

What exactly is yellow gold?

Yellow gold consists of pure gold mixed with other white metals, such as silver, copper, nickel and zinc to achieve greater durability, desired color tone and rich shine. The result gives off a classic warm glow.

Is yellow gold real gold?

Yes. Because pure gold is extremely soft, a yellow gold alloy retains the purest color. It is one of the oldest precious metals, known for its elegance and warmth, making it the perfect gift for a wide array of occasions.

Rose Gold

What is rose gold?

Rose gold is an alloy made of pure gold mixed with copper and silver that results in a soft pink complexion. The blend of these metals influences the final color and karat of the product.

What makes rose gold so unique?

With its early origins in Russia in the 19th century, pink gold or red gold has become a popular choice for jewelry. Romantic and feminine, its warm, inviting look complements a variety of diamonds and gemstones, such as peach or orange sapphires, as well as different styles and skin tones.

White Gold

What is white gold?

White gold is a mixture of pure gold with at least one other white metal, typically palladium, silver or nickel to achieve a less golden hue, add strength and durability. Its top rhodium coating not only makes the metal white, but it also polishes to a high shine, allowing any piece made with white gold to resist oxidation and corrosion.

Which is better, white gold or yellow?

Whether you choose white gold or yellow gold for your jewelry, both metals are of high quality. White gold jewelry, however, is more resistant to dents, scratches, and daily wear due to its higher alloy content. While it looks very similar to silver, white gold will not tarnish.

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Karat

Karat

Karat indicates the percentage of real gold in your jewelry. As a fractional measure of purity, the higher the carat value, the higher proportion of pure gold.

10k Gold

The minimum caratage for an item to be considered gold varies by country. The US legal minimum standard for gold caratage is 10 karats. An advantage of 10k gold is its accessibility and durability. Due to the alloy content, it stands up well to wear and tear. A soft, pale yellow color characterizes 10k gold jewelry.

14k Gold

In jewelry settings, 14k gold offers an ideal combination of color depth, durability, and reasonable accessibility. In addition to engagement and wedding rings, it is commonly used for fine jewelry. Compared to 10k gold, 14k gold jewelry boasts a brighter yellow hue.

18k Gold

18k gold is composed of 75% pure gold and 25% alloy. Its higher gold content makes it more expensive than 10k or 14k gold. Featuring a rich yellow color that contrasts well with diamonds, 18k gold is a great choice for earrings, necklaces, and other fine jewelry that’s not subjected to daily friction and rubbing.

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Buying Tips

Buying Tips

Selecting the right type of gold for your jewelry is easier than you think. To help you choose, consider the following:
  • Jewelry made of real gold has a hallmark identifying the assay test center's location and year of testing.
  • The higher the karat of gold, the deeper its orange-yellow color.
  • Despite 24k being pure gold, you are unlikely to find it on wearable jewelry since it is highly malleable, soft, and prone to scratching.
  • Diamonds appear even whiter when set in white gold, and warmer when set in yellow gold.
  • When comparing white gold vs yellow gold, white gold tends to be harder. If you are extremely active, white gold might be a better choice.
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Diamond Guide

Here's everything you need to know about the most precious and beautiful creations in the world.

Quality Factors

Not all diamonds are created equal. Here are the 4 key factors, also known as the 4Cs, used to describe and classify diamonds:
Color, Clarity, Cut, and Carat Weight.

Color

Clarity

Cut

Carat Weight

Color

Color

Diamonds range from colorless to light yellow and brown. Colorless diamonds are the rarest, therefore they are the most valuable. The highest diamond color grade is a D grade, which indicates that the diamond is completely colorless even when viewed under intense magnification. Subtle differences in color can dramatically af­fect a diamond's value. In fact, two seemingly identical diamonds can differ in value based on color alone.

Clarity

Clarity

Clarity is a measure of diamond purity and rarity, graded by the visibility of internal natural blemishes and unique inclusions under 10-power magnification. Clarity in a diamond indicates its rarity: there are eleven diamond clarity grades on the GIA clarity grading system, with Flawless being the rarest. In general, SI and VI are the best values.

Cut

Cut

Precise artistry and skill are required to achieve the most ideal cut for a diamond. Diamond cut is not determined by its shape (round, heart, oval, marquise, pear) but it is the symmetry, proportion and polish that affect how its facets interact with light. In more ways than one, cut determines the beauty of a stone.

Carat Weight

Carat Weight

Carats are used to measure the physical weight of diamonds. A carat is equal to 200 milligrams, so a 5-carat stone weighs 1 gram. The most popular carat weights are 1.25 ct and 1.0 ct. It's generally believed that the larger the carat weight, the more expensive the diamond. However, a diamond's price will also be based upon the careful combination of the other 3Cs: cut, clarity, and color.

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Lab-Grown vs Natural

Buying Tips

Lab-Grown vs Natural

Lab-Grown vs Natural

What is a lab-grown diamond?

As opposed to natural diamonds, lab-made diamonds are "grown" in a controlled laboratory environment without the negative environmental or human effects of mining.

Despite these differences, lab diamonds have the same visual and chemical components as natural diamonds. Carbon atoms form under immense pressure and high temperatures, then bond together to form crystalline lattice structures. The full-formed gem is cut and polished to reveal its maximum brilliance.

Are lab-grown diamonds real?

Lab-grown are as real as natural diamonds. Lab-grown diamonds have the same chemical makeup as natural ones, will come with a certificate of authenticity and go through the same 4C grading process.

How can you tell lab-grown and natural diamonds apart?

Diamonds grown in a lab do not look different from those grown in nature. Only an advanced microscope can tell the difference between a lab-grown diamond and a natural diamond: lab-grown diamonds do not contain nitrogen, while natural diamonds do.

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Buying Tips

Buying Tips

Whether you’re investing in your first diamond or looking for a special gift, selecting the perfect diamond is easier than you think. To help you choose, consider the following:

 

  • Be wise about choosing the right setting for your diamond. Color perception will vary depending on the precious metal used in the setting.
  • Diamonds have natural internal flaws. An average clarity grade will still look great to the naked eye.
  • The cut of a diamond will not only make it appear brighter, but also larger than its carat weight.
  • Besides diamonds, color gems like sapphires, emeralds, morganites or aquamarines make for incredible engagement rings.
  • Lab-grown diamonds can cost 40 to 50% less than natural diamonds of similar size and quality.
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