Terms and Limitations

1) The presented report encapsulates the considered findings of TGL gemologists, arrived at through a rigorous and scientific examination, reflective of the prevailing scientific standards at the time of issuance. It is imperative to note that TGL, along with its staff, disclaims responsibility for any disparities in examination outcomes arising from the adoption of new technologies or methodologies at any given point in time. As a standard practice, TGL Labs remains committed to the ongoing enhancement of detection technologies.
It is essential to recognize that TGL and its staff do not provide an assurance that other laboratories will reach identical conclusions. The content of this report is an expression of the most informed professional opinion held by TGL at the time of its release. It is paramount to acknowledge that results from analyses conducted by other entities may diverge, contingent upon factors such as the timing, methodology, and personnel involved in the examination of the samples.


2) The gemstone origin identification service provided by TGL is founded upon a comprehensive evaluation and analysis conducted by seasoned gemologists utilizing state-of-the-art laboratory instruments. It is essential to note that distinct laboratories may employ varying criteria for judgment in their assessments. Consequently, customers are advised to recognize that divergent opinions regarding the origin of the same gemstone may arise from different laboratories.
TGL maintains a commitment to precision and expertise in its assessments, yet acknowledges the inherent variability in methodologies employed by different gemological entities. This awareness is crucial for customers seeking origin information for gemstones, as interpretations may differ across laboratories based on their respective evaluation criteria and analytical approaches.


3) The customer acknowledges and agrees that TGL Laboratory, as well as its staff, disclaims any responsibility for alterations observed in the submitted samples during the routine examination process. This includes changes in appearance, color, weight, quality, and other external/internal factors.


4) The gemstones and jewelry submitted to TGL for inspection are to be insured by the client against all risks during shipments and the inspection period within the institute. The client expressly agrees to indemnify and hold TGL and its employees harmless from any and all losses, damages, or destruction of samples left for inspection while in the possession of TGL, arising from any cause whatsoever. This indemnification remains in effect unless proven fraud or willful misconduct on the part of TGL or its employees is substantiated. TGL and its employees shall not be held liable under any other circumstances.

Ruby and Sapphire:

Effect of Heat Treatment	No Residue Found	Residue within fissures			Residue with Cavities
Amount of residue	None	Minor	Moderate	Significant	Minor	Moderate	Significant
Code	"Evidence of Heat Enhancement"	Ha	Hb	Hc	1	2	3

Evidence of heat enhancement: This denotes a procedure employing fundamental methods, yet yielding results devoid of any detected residue within the cavities and/or fissures. Rubies and sapphires subjected to HPHT treatment commonly receive this classification as well.


Enhancement with lead: Vitreous residue was observed within the fissures and/or cavities of the examined items.


Enhancement with light element: The hue of the items has undergone subtle or significant modification through a process of bulk diffusion, wherein minute coloring ions such as beryllium have permeated through the majority of the stone.


Surface diffusion: The item has undergone modification through a surface diffusion process, facilitating the penetration of coloring ions into the stone at a microscopic level. The resultant coloration is stable; however, it may be susceptible to removal during subsequent recutting or re-polishing procedures.


Emerald : Clarity enhancement in emeralds will be categorized as minor, moderate, or significant based on the quantity of filling substance observed within surface-reaching cavities and/or fissures of the item.