How to Make the Right Choice

The purchase of a luxury piece of jewelry is an important event in your life. Before you embark on this experience, you have the right to know all you can about how to select the perfect and one-of-a-kind piece of jewelry for you or your loved one. For this reason we developed a detailed guide to diamonds, precious stones and other materials we work with at ALO diamonds. We will share with you how to recognize a quality gem and how to choose only the best one.


Diamonds are the most valuable mineral on Earth. Not all diamonds are equally valuable though and their size is not the only indicator of quality. A raw diamond looks more like a piece of glass. Only careful expert craftsmanship and perfect cutting of facets turn this unrefined raw material into a glimmering gem.


Experts assess diamond quality according to four criteria known as the four “C”s: cut, clarity, color, and carat weight. These qualities are defined for the individual stones before they are placed in a piece of jewelry.

Jeweler Standards

ALO Jewelry uses only diamonds that meet the highest standards. For each piece of diamond jewelry from our collection we issue a certificate verifying the authenticity of the precious stone and describing its excellent quality in detail. Stones of size above one carat also receive a certificate from the independent internationally recognized GIA Laboratory. Its assessment is respected by diamond experts worldwide.

The High Quality of ALO diamonds

Since we buy the stones for our jewelry in person in the world diamond trading centers of prestigious exchanges in Antwerp and Israel, we can offer you first-class diamonds at very attractive prices. ALO diamond jewelry is top-quality, highly durable, and makes a wonderful investment. You can experience its most important quality yourself at first sight: it is exceedingly beautiful.

  • Round

    The round diamond shape is currently the most popular and most sought-after. It reflects light and thereby enhances the brilliance of the diamond. For hundreds of years, diamond cutters have used their knowledge of optical factors and complex mathematical calculations to achieve the ideal shape of the round diamond. As a result they have arrived at the currently classic shape, cut into 57 facets.
  • Emerald

    This shape primarily brings out the clarity of a diamond. It differs from the others in its bottom section, called a pavilion, which is cut into rectangular facets, creating a unique optical impression. Like the classic round cut, it is arranged into 57 facets.
  • Marquise

    The elegant Marquise shape, composed of 55 facets, allows the diamond to retain the highest carat weight. Moreover, this shape seems larger when examined by the naked eye. Individual Marquise diamonds can differ by being wider or narrower.
  • Radiant

    A four-sided diamond with splayed corners has a very diverse range of use. It is used in square as well as in rectangular shapes. It is composed of 70 facets.
  • Heart

    The romantic shape of this diamond, composed of 59 facets, designates it for a very specific purpose. It usually tends to be a part of engagement ring or as an expression of your romantic feelings.
  • Princess

    The four-sided Princess shape is particularly popular in engagement rings. Its proportions among the individual diamonds can differ significantly, and therefore the Princess can have either a square or rectangular shape. It has a high number of facets - 76.
  • Asscher

    The Asscher is highly reminiscent of the Emerald, but it has a square shape. It brings out the clarity of the diamond. Its bottom section, called the pavilion, is cut into rectangular facets, creating a unique optical impression. It is composed of 57 facets.
  • OVAL

    Diamonds cut into an oval shape, or a round shape, greatly enhances the brilliance of the diamond. This shape is composed of 55 facets. It is usually placed into rings which look particularly good on long, slim fingers.
  • Pear

    A diamond in a teardrop shape with one end pointed and the other curved, can be mounted in various types of jewelry. It is made up of 56 facets. When mounted in rings, this elongated teardrop has a slimming effect on the finger.
  • Cushion

    This diamond in the shape of a cushion with rounded corners has 58 facets and is noted for its unique brilliance. This shape brings out the exceptional clarity of the stones.

The quality of the cut is one of the "four Cs" or basic criteria according to which jewelers assess all diamonds. Why is the cut so important? The cut of the diamond determines how the gem will reflect light. The better the cut, the more brilliant the diamond. A perfectly cut diamond is sparkling from all angles and there is an iridescent glimmer called fire, which is created by reflection of light against the individual facets. Compared to this, a poorly cut diamond is cloudy, glassy, and contains areas which appear darker since they do not reflect light.

  • Ideal / Excellent

    Top cut diamonds of the highest quality represent approximately three per cent of overall diamond production. They reflect almost all light which hits the diamond.

  • Very good

    Diamonds in this category make up approximately 15% of the highest quality cut diamonds. They reflect almost the same volume of light as an Ideal / Excellent diamond and for a non-expert eye they are for the most part indistinguishable.

  • Good

    About a quarter of diamond production falls into this category. They reflect a majority of the light that hits the facets.

  • Fair

    Still a quality cut diamond, the level of brilliance of diamonds in this category is recognizably lower than diamonds of higher categories.

  • POOR

    These diamonds do not meet the requirements for quality cut. Most of the light which falls on the diamond is lost, which causes the stone to lose its brilliance.

ALO diamonds uses only diamonds from the Ideal or Excellent and Very Good categories. We place only the narrowest selection of top cut diamonds in our jewelry.

A diamond with no color is considered perfect. These diamonds can best distribute light and create an iridescent glimmer called fire. The majority of natural diamonds contain coloration caused by minute impurities inside the stone. This coloration, while practically imperceptible to the naked eye, can cause differences in the price of individual diamonds by thousands of dollars.

We divide white diamonds according to following color categories:

  • D


    First-class white +

    The most highly ranked (only extremly rare diamonds).

  • E


    First-class white

    An expert gemologist with a trained eye can detect imperceptible traces of coloration. This is a very rare diamond.

  • F


    Very white +

    An expert gemologist can observe coloration, but the diamond can still be considered colorless. This is a diamond of very high quality.

  • G


    Very white

    An almost colorless diamond.

  • H



    Colouration is evident when compared to diamonds of higher categories. Nonetheless this is still a stone of excellent quality.

  • I-J


    Lightly toned white

    We do not use these diamonds at ALO.

  • K-M


    Toned white

    We do not use these diamonds at ALO.

  • N-Z


    Light yellow – almost yellow

    We do not use these diamonds at ALO.

Please note that naturally colored diamonds also exist. For these, the coloration is desirable and their price is many times higher than the price of white diamonds.

A perfect diamond is very rare. Almost all diamonds contain minor flaws and imperfections – for example, microscopic scratches or traces of other minerals. A diamond is considered “flawless” when it has no visible external or internal flaws at ten-times magnification. Truly flawless diamonds are very rare which is reflected by their high price.


We divide diamonds by clarity into the following categories:

  • LC

    Loupe Clean

    Without any internal or external defects. These diamonds are extremely rare.

  • VVS1,

    Very, Very Slightly Included

    At ten-times magnification it is very difficult to uncover any flaws. A diamond of excellent quality.

  • VS1,

    Very Slightly Included

    Flaws are not visible to the naked eye.

  • SI1,

    Slightly Included

    Flaws are visible at ten-times magnification and are visible to the naked eye. A diamond of acceptable quality

  • I1, I2,

    A diamond of poorer quality.

At ALO diamonds we use only diamonds from SI1 category and higher. We reject stones with minor defects that many other jewelry firms would accept.

The size of a diamond, indicated in carats (1 carat = 0.2 g), is one of the most important deciding features for its price. Understandably, it is not the only factor though. Two diamonds of the same size can differ significantly in price if they have different levels of quality of their clarity, color and cut. A smaller but higher quality stone can be more beautiful than a larger diamond with visible defects.


Small diamonds occur more frequently in nature than larger ones. For this reason the larger ones are also priced higher. The price of a diamond rises exponentially with its size. For example, a two-carat diamond will not be double the price of a one-carat diamond of comparable quality, but significantly more.

If you are deciding on the size of a diamond for an engagement ring, take into consideration not only your budget, but also the size of the finger for which it is intended. A small diamond will look far larger on a slim finger than it will on a larger finger.

ALO diamonds uses only the most beautiful colored gemstones, which are hand-selected one piece at a time. You can find twenty types of gemstones in beautiful shades of color in our offering.


Every precious stone will catch you attention primarily with its color. This is the most distinctive characteristic that also drives its value.

The most valuable precious stones which are considered the ones with basic color not diluted with other color shades. Each color can also appear in various lighter or darker shades.

The most desirable colored gemstones are the ones with living colour not weakened by brown or grey tones.

ALO diamonds uses only the most beautiful colored gemstones, which are hand-selected one piece at a time. We offer twenty types of gemstones in forty beautiful shades of color.

  • Topaz Topaz
  • Amethyst Amethyst
  • Citrine Citrine
  • Peridot Peridot
  • Garnet Garnet
  • Rhodolite Rhodolite
  • Iolite Iolite
  • Rose Quartz Rose Quartz
  • Emerald Emerald
  • Ruby Ruby
  • Sapphire Sapphire
  • Tourmaline Tourmaline
  • Apatite Apatite
  • Smoky Quartz Smoky Quartz
  • Beer Quartz Beer Quartz

Since every colored gemstone is unique, its clarity must also be assessed individually.


The presence of trace minerals does not mean that a gemstone is of a lesser quality. For example, with rubies and emeralds, small imperfections are entirely acceptable, whereas blue topaz or citrine tend to have far fewer of them. It is very rare that gemstones occur without any imperfections and trace elements. If so, they are sold for astronomical prices.

ALO diamonds uses only colored gemstones of clarity that fulfils our high demands for quality. When selecting a specific gemstone for you or your loved one, you can enjoy expert guidance from our Certified Sales Staff.

Colored gemstones are typically cut in a way that brings out their color and downplays their imperfections.

Gemstones which boast rich color are sometimes cut into shallower shapes than usual in order for the stone to absorb and reflect the greatest amount of light. On the other hand, less richly colored stones are cut into deeper shapes in order to emphasize their color. A properly cut gemstone should have symmetrically arranged facets. Every asymmetry testifies to the fact that the original material was a stone of a lesser quality.

ALO diamonds always cuts gemstones in a way that brings out their beautiful natural qualities. The beauty of a gemstone is more important for us than its size.

Although we may know how many carats a gemstone weights, it does not mean that we know its size.

Various stones have various densities, and two large gemstones that look the same can have very different carat weights. For example, a ruby has a greater density than a diamond, and therefore a one-carat ruby looks smaller than a one-carat diamond.

ALO diamonds uses various sizes of the twenty types of gemstones we carry and thereby we enable everyone to find the right stone for themselves or their loved ones.

While some precious stones such as sapphire or ruby fall right behind diamonds as some of the hardest minerals in the world, it certainly does not mean that they are indestructible.

Do not expose them to sharp impacts, friction against rough surfaces, or contact with chemicals. Store them in a cushioned box or individually wrapped in soft fabric so that your jewels will not scrape against each other. As far as cleaning is concerned, various types of precious stones require different kinds of care. Some are sensitive to everyday household cleaning products, others do not respond well to sudden changes in temperature. When cleaning individual types of precious stones, always follow our recommendations. Unless indicated otherwise, it is sufficient to carefully clean your precious stones with a special jewelry cleaning product and to wipe them dry with a soft cloth.

ALO diamonds offers a lifetime service for every piece of jewelry purchased. Each piece of jewelry deserves expert inspection and cleaning once per year. You can receive expert care in our boutiques or from our authorized dealers.

  • Topaz Topaz

    Basic care

  • Amethyst Amethyst

    Basic care

  • Citrine Citrine

    Basic care

  • Peridot Peridot

    Basic care

  • Garnet Garnet

    Avoid sudden changes in temperature.

  • Rhodolite Rhodolite

    Basic care

  • Iolite Iolite

    Basic care

  • Rose Quartz Rose Quartz
    Rose Quartz

    Basic care

  • Emerald Emerald

    Do not use ultrasound cleaning. Avoid sudden changes in temperature, contact with chemicals, perfumes, hair products and other cosmetics.

  • Ruby Ruby

    Do not use ultrasound cleaning. Avoid contact with household chemicals.

  • Sapphire Sapphire

    Do not use ultrasound cleaning. Avoid contact with household chemicals.

  • Tourmaline Tourmaline

    Do not clean with ultrasound. Avoid sudden changes in temperature.

  • Apatite Apatite

    Basic care

  • Smoky Quartz Smoky Quartz
    Smoky Quartz

    Basic care

  • Beer Quartz Beer Quartz
    Beer Quartz

    Basic care

  • Cogniak Quartz Cogniak Quartz
    Cogniak Quartz

    Do not use ultrasound cleaning. Avoid sudden changes in temperature, contact with chemicals, perfumes, hair products and other cosmetics

  • Lemon Quartz Lemon Quartz
    Lemon Quartz

    Basic care

Pearls are one of the most popular precious jewelry material due to their timeless elegance and classy charm.


Natural pearls are rare due to the exacting requirements to form them in the wild. The majority of pearls sold today are cultivated in artificial breeding grounds. A cultivated pearl is created when a small grain is inserted into an oyster which then gradually wraps it in layers of natural minerals and proteins – a pearl is formed. Nacre is cultivated this way. This material is distinctive for its beautiful shine and color.

According to their origin, the pearls are classified as freshwater or saltwater pearls. Freshwater pearls, which tend to be smaller and less expensive, are imported mostly from China. Luxury saltwater pearls are larger and more expensive. Most of them are cultivated in protected lagoons off the coast of Australia and Pacific Islands.

There are no pre-determined categories for assessing the quality of pearls.

However, ALO diamonds has its own very strict protocol for the selection of pearls. We offer you only pearls that meet our high standards.


Pearls are mostly in white, cream, yellow, pink, salmon, gold, or black color. Pure white pearls are considered the most valuable.

Light that falls on the surface of a pearl, gives the pearl its characteristic soft gleam. This is caused by the light being reflected off many tiny crystals of a tabular aragonite. The larger the pearl, the more nacre it contains and the more intense is its shine.

ALO diamonds uses only the highest quality freshwater pearls in three colors: white, pink, and black. We also offer saltwater pearls, white Australian and black Tahitian pearls which we mount in luxury jewelry and often augment with diamonds.


The most valuable and sought-after pearls are round.

Oval pearls or pearls of irregular shape are considered of lesser quality. The value of a pearl is reduced also by various irregularities on its surface which can arise during the accumulation of nacre. The size of a pearl depends on its origin. Freshwater pearls have a diameter of 3-7 millimeters, saltwater pearls are larger, and can reach a diameter of up to 13 millimeters.

ALO diamonds uses only the most beautiful round pearls of various sizes.


The best thing you can do for your pearl jewelry is to wear it regularly. Soft friction against your skin will polish your pearls and preserve their characteristic shine.

Word of caution: pearls should not come into contact with chemicals including perfume, makeup, and hair products. If they do, they can lose their shine and their surface can take on an unpleasant matte appearance.

Store your pearls in a cushioned box or wrapped in a soft fabric. Separate them from other jewelry that might scrape their sensitive surface.

ALO diamonds offers a lifetime service for jewelry purchased there. Once a year your pearl jewelry deserves an expert inspection and cleaning.

Gold is not considered a precious metal solely for its unquestionable beauty. It has many extraordinary qualities, which make it valuable in medicine and electronics as well.


Gold never loses its shine and it never rusts. It is the most malleable of all metals. One gram of gold can be pressed into a foil sheet of one square meter. Pure gold is too soft for the production of jewelry. Therefore other metals such as silver, copper, palladium or zinc are added to it. The purity of gold is then given in carats: 24 carats is 100% gold, 18 carats means an alloy of 18 parts gold and 6 parts of an added metal (in other words, 75% gold content). 14 carats is an alloy of 14 parts gold and 10 parts other metal. The type and quantity of the added metal also influences the color of the gold. “White” gold is produced by mixing it with white precious metals i.e. palladium.
Rose gold comes from mixing it with copper.

Our gold jewelry is safe for children. Our gold earrings can be worn by children from newborn age on.