Agate stones

media-13_0Agate stone is a verity of silica, Which is characterised on the basis of its fineness of grain and brightness of colour. These are mainly found with kinds of rocks such as classically in volcanic rocks and commonly in some metamorphic rocks.

Agate most commonly used for hard-stone curving in ancient times and these are from various places which were from the times of bronze age. Agate mostly formed as a result of ancient lava explosion or nodules in volcanic rocks.

Cyclops agate agate also known as Mexican agate is a type of agate included with matter of green, golden, red, black colours or by their combinations. Dendrite agate or moss agate is another agate type with fern like pattern on them due to the presence of manganese and iron oxide. Limb-cast agate is formed from void left by decomposed vegetative materials. En-hydro agate contains tiny illusions of water, air bubbles while they are formed. There are many more types of agate such as tarantella  agate, lake-superior agate, condor agate, fire agate, etc.

agate explored on base of their hardness in industrial sector, they have a high ability to resist chemical attack and retain highly polished surface finish.

DHC International Participated in Hyderabad Jewellery, Pearl and Gem Fair (HJF)

DHC International , Leading Testing Lab and Institute participated Hyderabad Jewellery, Pearl and Gem Fair (HJF) on  June 4, 2016 .

Hyderabad Jewellery, Pearl and Gem Fair (HJF 2016) organised by UBM India, India’s leading exhibition organizer, commenced its 9th edition today at the Hyderabad International Convention Centre, Novotel.  Chief Guest  Shri Bonthu Ram Mohan, Mayor – Greater Hyderabad Municipal Corporation and other key dignitaries,  Ms. Jittima Nakamano, Consul (Commercial) of Royal Thai Consulate General and the Director of Thai Trade Center, Mr. G V Sreedhar, Chairman, All India Gems & Jewellery Trade Federation, Mr. Mahendra Tayal, President, Hitech City Jewellers Manufacturers Association and Mr. Yogesh Mudras, Managing Director, UBM India inaugurated the 9thedition of HJF in the presence of other dignitaries from the jewellery trade.

Some of the notable exhibitors participating this year include: Anmol Jewellers, Swaroop Jewellers, Meenakshi Jewellers,  Ramesh Chand Jewellers, Inderlal Balmukund Jewellers, Sri Balaji Jewellers, Siddi Vinayak Jewellers & exporters and P Mangatram Jewellers Pvt. Ltd. , DHC International amongst others. The fair is supported by key jewellery associations from across South India, including the Hyderabad Jewellers Manufacturers Association (HJMA), AP Gold Silver & Diamond Merchant Association and more than 100 plus district associations.

For the first time, this edition of HJF will witness the Telangana & AP Retail Jewellers Awards 2016 ( 4th June ) , a unique initiative honouring the best in the retail jewellery business of the states.

Navaratna Stones

Navaratna is the Sanskrit word that means nine gems. The jewellery formation with these nine gems is considered as sacred even in these modern days. The Asian countries such as India, Nepal, Sri Lanka, Singapore, Myanmar, Cambodia, Vietnam, Indonesia, Thailand and Malaysia without any cultural or religious differences.

Ancient vedic scriptures and teachings have mentioned gems as one of the 6 pathways to alter the negative karmic life and remove obstacles in life and fills with feeling of happiness and fulfilment.

The vedic gems gems are also believed to have a therapeutic value. The Garuda purana and agni purana have discussed the science of gemmology and characteristics of  gemstones that bring about auspicious changes in life.

Navaratnas and Planets

  • Ruby for Sun
  • Pearl for Moon
  • Red-coral for Mars
  • Emerald for Mercury
  • Yellow-sapphire for Jupiter
  • Diamond for Venus
  • Blue-sapphire for Saturn
  • Hessonite for ascending lunar node
  • Cat’s eye for descending lunar node

About DHC International gem lab and Institute

DHC international Gem testing lab and Diamond Institute provides Gemmology courses, Diamond Grading, Diamond testing, Diamond Grading.Consultation for Diamonds and Gemstones with us confirms international standards with our Gem Testing Lab and Diamond Testing Lab. Under DHC, we provide Diamond grading and Gemmology Courses with high quality and standards in Kerala. Our business philosophy is to “keep it simple”. By keeping it simple we find that things just work better and we can focus more time and energy on the job in hand. We will always select the most appropriate method for your good.

How to choose a quality diamond

There are some facts that we should take into account before choose a diamond.the basic things that we want to know about diamond is that not all diamonds are equal they are differ and unique. They can be differ by shapes,  colours, sizes and with various internal characteristics.

A polished diamond has its value. The value decides with some factors. Rarity is one of these factors. Diamonds with certain qualities are more hence they are valuable than others

there are some systematic way to evaluate every diamond. If this lacks, there would be no way no way to compare one diamond to another and evaluate the qualities of an individual diamond. The grading system by GIA from 1950’s are used by the Professionals. Main factors taken into account were clarity, colour, cut and carat weight for describing quality of diamond.


Difference in colour affect diamond value if two diamonds with same clarity, weight, cut can differ in value based on colour alone. Colour less diamonds are very rare. Most of the diamonds have tints of yellow or brown hence slightest colour change can make a vast change in diamond’s value.


Diamonds with clarity is the relative absence of inclusions blemishes. The internal features are called inclusions and surface irregularities are called blemishes. Blemishes include scratches and nicks on a diamond surface and inclusions are generally inside, these can be breaking surface of the stone or minerals trapped inside while forming them.

Clarity not only have negative influence but also have positive effects such as helping geologists separate diamond from imitations.


Its purely the craft man’s skill and care. When light falls on the diamonds from every angle and every facet affects the amount of light returned to the eye. This is what it its face-up appearance. In efforts to differentiate themselves, and because increasing demand for precision in cutting, many manufacturers fashioned diamonds to exacting standards through out the decade.

Carat weight

every thing we buy depends upon weight, thus diamonds also depending on weight. Diamonds are weighed on unit metric carat they are 0.2 gram or 0.007 ounce. One ounce contains 142 carats.

The weight is not only the factor that depends the value hence it is not easy to collect their value based on weight only. 1kg sugar 40 rupees then 2kg sugar will worth rupees 40 this is usual but in the case of diamonds it is different a diamond same properties and double the weight can have value more than the double of the smaller. This is because the large diamonds are more scarce than the smaller.the scarce something worth more.

What is Gemstone ?

A gemstone is Known by different names a gem,fine gem, jewel, precious or semi-precious stones etc. A gemstone is actually nothing but an mineral crystal which are polished and cut to get their real form. They are mainly used to make jewellery  or ornaments. Hence some stones which are used to make jewellery which are not minerals considered to be gemstones

Most of the gemstones are hard but there are some which is soft. They are soft minerals used in jewellery because of their lustre or other properties. Lustre is nothing but the way the light interacts with the surface of the minerals.Rarity or scarcity is the another thing that lends the gemstones the higher value.

A gemstone maker is called as gem cutter or lapidary and a diamond worker is a diamondtaire.

The different certified gemstones listing is available at:

How to Care your Diamond

Diamonds are the hardest known substances on earth. But this doesn’t mean that they are non-destroyable. While they can be cut and polished only by another diamond, a hard blow can chip it. So never wear diamond jewellery while doing rough work.

Exposing diamond to high heat can damage the surface of the stone. This happens occasionally when jewellery repair is done without protecting or removing the diamond. High heat can also cause colour change, fractures or cleavages in the diamond depending on the nature and extent of its internal flaws.

Diamonds can scratch each other as well as other jewellery pieces, so they should be stored individually. Diamond jewellery pieces are best stored in a fabric-lined jewel case or in a compartmentalised box. You can also individually wrap jewellery in soft tissue paper or use jewellery pouches for each piece.

If you notice loose stone settings or any other noticeable damages to your jewellery, do not wear it, until it is assessed and repaired by a trusted, professional jeweller. We recommend that you get your diamond jewellery checked annually.

When travelling, store your diamonds in soft jewellery bags, individually, and use specially designed jewellery travel case if you can get one. Never leave your diamond ring on the rim of the sink or bath tub because it can easily slip into the drain. Don’t take off your jewellery in a public place, you may accidentally forget it and lose it forever.