Approved Gemstone Testing Laboratories

Gemrockauctions has one of the largest range of Certified Gemstones online. Our goal is to have the most comprehensive and competitive priced range of certified Gemstones. Our Verified sellers can only have gemstones certified by the laboratories listed below. New laboratories can be submitted to our Gemstone Advisory Panel for inclusion to this list.

Approved Gemstone Testing Laboratories Approved Gemstone Testing Laboratories Approved Gemstone Testing Laboratories Approved Gemstone Testing Laboratories

Our Gemstone Sheriff program also reviews sellers descriptions to give buyers confidence in our Gemstones. The following table outlines the testing capability of the gemology laboratories used on GemRockAuctions

Approved Gemstone Testing Laboratories

* Synethic gemstone detection can be extremly difficult for Quartz (Citrine, Amethyst, Ametrine), Beryl (Aquamarine, Morganite). Advanced equipment must be used which some laboratories may not have.

** Jaedite treatments can be detected by basic equipment, however some treatments require advanced equipment which some laboratories may not have.

*** It is extremly difficult to test for treatment via irradiation. For this reason many reports do not mention irradiation as a treatment, even on commonly treated gemstones like Topaz.

Treatment Description Common stones that this treatment applies too
Heat Treatment This is the detection of a stone being heated by tradition methods. This involves putting a gemstone in a furnace and controlling the temperature as well as the environment inside the furnace to improve the clarity and colour of a gemstone Sapphire, Ruby, Dementoid Garnet, Tanzanite, Citrine, Aquamarine, Paraiba Tourmaline, Apatite, Zircon
Heat Treatment with light elements This is sometimes referred to as New heat, Advanced heat or Beryllium Treatment. Like tradition heating, the gemstones re placed inside a furnace and heated, however in this case additives such as Chrysoberyl powder are added to the environment. The Chrysoberyl powder contains beryllium which penetrates the gemstone and gives it a new colour. Sapphire, Ruby
Heat Treatment with foreign objects (Glass filled ect) This form of heat treatment adds a foreign substance into the gemstone which will help to fill up cracks and reduce the visibility of them. The most common gemstone is the Glass Filled Ruby. Ruby, Sapphire, Diamond, Aquamarine, Morganite
Heat Treatment with Surface Diffusion The for of heat treatment adds elements into the furnace that cause colour. For example, Titanium help create the blue colour in Sapphire. If Titanium is added to the furnace, a thin layer of Titanium will bond to the crystal of the Sapphire and create a more brilliant blue. This colour is only a very thin layer as it does not penetrate deeply into the gem. Sapphire, Ruby
Synthetic Gemstones* Synthetic gemstones are gemstone that have the exact same chemical composition, gemmological properties and look as a natural stone, however they created in a laboratory by man. Ruby, Sapphire, Diamond, Emerald, Spinel, Quartz, Amethyst, Citrine, Ametrine, Aquamarine, Morganite
Imitation Gemstones The are gemstones that look like their natural counterparts, but are made of a different material. Example red glass imitating a Ruby All gemstones can be imitated
Gemstones that have been Oiled, Dyed, Impregnated** Some gemstones can have their colour improved by bleaching them and dying them with colouring agents. Jade, Turquoise, Malachite, Howlite, Sapphire, Ruby, Lapis Lazuli, Coral, Emeralds,
Origin Determination Origin determination uses a huge database of information to determine where a gemstone came from. Generally the chemical composition and the inclusions will give a very good indication of origin. Each gemstone lab will have their own database, so the bigger gemstone labs will have more of a chance of being able to identify where the gemstone has come from. This can have great bearing on the price and gemstones from certain localities are rare. Ruby, Sapphire, Emerald, Paraiba Tourmaline
Diamond This refers to the correct grading of diamonds using the 4C’s that was originally developed by the GIA. The GIA has the master set of Diamonds that all other diamonds are compared against for colour. Diamonds
Report Authentication Available In this day and age, there are people who will forge or create false identification reports. To combat this problem, many of the gemmological laboratories offer a report authentication service. All gemstones

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