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GIGGL is a pioneer in the colour gemmological laboratory in the India to issue country-of-origin rep

The Laboratory is equipped with state-of-the-art instrumentation, and applies standard gemmological, as well as advanced analytical, techniques to each determination it makes. Building on our cornerstones of meticulous characterization and disclosure, GIGGL has a long tradition of acquiring staff who are experts in the field of gemstone testing and reporting.

05/01/2021

Gemstone identification & grading

14/05/2016

Perfect shining spheres. Lustrous baroque forms. Seductive strands, warm to the touch. Pearls are simply and purely organic.
The qualities that determine a natural or cultured pearl’s value are size, shape, color, luster, surface quality, nacre quality, and—for jewelry with two or more pearls—matching.
Of the seven pearl value factors, luster might be the most important. Luster is what gives a natural or cultured pearl its unique beauty. Pearls with high luster have sharp bright reflections on the surface. Different pearl varieties have different standards for luster. If surface characteristics are numerous or severe, they can affect the durability of the pearl and severely depress its value. Surface characteristics have less effect on the pearl’s beauty and value if they are few in number, or if they are minor enough to be hidden by a drill-hole or mounting.
Pearls come in eight basic shapes: round, semi-round, button, drop, pear, oval, baroque, and circled. Perfectly spherical pearls and symmetrical drops are the most valued. There are exceptions, though. Well-formed pear, oval, or baroque cultured pearls are also prized by pearl lovers. Pearl body colors vary by variety. Although white and black are traditional, unusual colors are becoming more popular. Overtones in a pearl’s luster and the rainbow iridescence known as orient also add to the color of a pearl.

12/05/2016

Garnets are a set of closely related minerals forming a group, with gemstones in almost every color.Red garnets have a long history, but modern gem buyers can pick from a rich palette of garnet colors: greens, oranges, pinkish oranges, deeply saturated purplish reds, and even some blues. Red garnet is one of the most common and widespread of gems. But not all garnets are as abundant as the red ones. A green garnet, tsavorite, is rarer and needs rarer rock chemistries and conditions to form.
Demantoid is a rare and famous green garnet, spessartine (also called spessarite) is an orange garnet, and rhodolite is a beautiful purple-red garnet. Garnets can even exhibit the color-change phenomenon similar to the rare gemstone alexandrite.

All garnets have essentially the same crystal structure, but they vary in chemical composition. There are more than twenty garnet categories, called species, but only five are commercially important as gems. Those five are pyrope, almandine (also called almandite), spessartine, grossular (grossularite), and andradite. A sixth, uvarovite, is a green garnet that usually occurs as crystals too small to cut. It’s sometimes set as clusters in jewelry. Many garnets are chemical mixtures of two or more garnet species.

11/05/2016

This time we have a woman's best friend, "Diamonds".
Diamonds are among nature’s most precious and beautiful creations. Diamond forms under high temperature and pressure conditions that exist only about 100 miles beneath the earth’s surface. Diamond’s carbon atoms are bonded in essentially the same way in all directions. Another mineral, graphite, also contains only carbon, but its formation process and crystal structure are very different. Graphite is so soft that you can write with it, while diamond is so hard that you can only scratch it with another diamond.
Diamonds are the hardest material on earth: 58 times harder than anything else in nature.
“LUCY” IN THE SKY
Fifty light years from earth, this star is a 10 billion-trillion-trillion carat diamond.

10/05/2016

The name “sapphire” can also apply to any corundum that’s not ruby, another corundum variety. Besides blue sapphire and ruby, the corundum family also includes so-called “fancy sapphires.” They come in violet, green, yellow, orange, pink, purple, and intermediate hues. Some stones exhibit the phenomenon known as color change, most often going from blue in daylight or fluorescent lighting to purple under incandescent light. Sapphires can even be gray, black, or brown.
In pictures, the wide range of colours and dimensions in sapphire.

09/05/2016

Ruby is the most valuable variety of the corundum mineral species, which also includes sapphire. Rubies can command the highest per-carat price of any colored stone. This makes ruby one of the most important gems in the colored stone market. In its purest form, the mineral corundum is colorless. Trace elements that become part of the mineral’s crystal structure cause variations in its color. Chromium is the trace element that causes ruby’s red color.
MOGOK is Myanmar’s legendary valley of rubies; the source of many of the world’s most fabulous gems.

In pictures, On May 12, 2015, a 25.59-carat ruby ring sold for $1,266,901 per carat, setting a new record at auction for a colored gemstone.

07/05/2016

The best Aquamarines combine high clarity with limpid transparency and blue to slightly greenish blue hues. Like many beryls, aquamarine forms large crystals suitable for sizable fashioned gems and carvings.
Aquamarine is mined at high elevations in Pakistan’s Karakoram Mountains.
Faceted aquamarine is often exceptionally transparent with vitreous luster,
so it really sparkles.

06/05/2016

The essence of the color purple, amethyst is beautiful enough for crown jewels yet affordable enough for class rings.
Amethyst was as expensive as ruby and emerald until the 19th Century, when Brazil’s large deposits were discovered. Today, as the most valued quartz variety, amethyst is in demand for designer pieces and mass-market jewelry alike, and its purple to pastel hues retain wide consumer appeal.

05/05/2016

2011 sales price for Elizabeth Taylor’s emerald pendant - a record $280,000 per carat.
The Elizabeth Taylor Bulgari emerald suite, given to her by Richard Burton. The pendant alone achieved US$6,587,500 at the Christie's auction.

04/05/2016

Amber is an organic gem. Organic gems are the products of living or once-living organisms and biological processes. Amber formed tens of millions of years ago, when sap from ancient trees hardened and fossilized.
Scientists and collectors treasure amber that contains suspended animal or plant fragments. These fossilized bits of once-living things were trapped in the hardening amber, creating a fascinating time capsule.

Some types of amber are found in the ground. Other types have been freed and carried by tides, ending up on beaches or near-shore areas. The Baltic coast bordering Germany, Poland, and Russia is still an important source of amber.
Amber is sometimes called “gold of the North.” Its warm luster is featured in beads, carvings, pendants, and cabochons, as well as decorative items like cups, bowls, s***f boxes, and umbrella handles.

A related material, called copal, is also fossilized tree resin, but it’s far younger than amber, at less than a million years old.

The oldest amber dates to the Upper Carboniferous Period (approximately 320 million years ago).

The image shows an amber included with a scorpion.

03/05/2016

Often described by gem aficionados as “emerald by day, ruby by night,” alexandrite is the very rare color-change variety of the mineral chrysoberyl. Originally discovered in Russia’s Ural Mountains in the 1830s, it’s now found in Sri Lanka, East Africa, and Brazil, but fine material is exceptionally rare and valuable.

While Russia is the most famous alexandrite source, this stone from Brazil shows beautiful color change from daylight (left) to incandescent light (right).
Source - GIA

Address

29/B Zakaria Street
Kolkata
700073

Opening Hours

Monday	9am - 8pm
Tuesday	9am - 8pm
Wednesday	9am - 8pm
Thursday	9am - 8pm
Friday	9am - 8pm
Saturday	9am - 8pm

Telephone

+919831342597

Website

http://www.giggl.co.in/

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