Luangpor Lum's(Wat Samakitham) limited pieces "Kao Phra Pu" 5 in one Pidta
Many times I come across people asking me to verify their amulets if they would be real or fake and my usual respond is simple. If you think it's real it's real and if you think it's fake it's fake. Getting someone to "Verify" other peoples amulet is a very sticky situation. Some people will say anything when they do not have a particular amulet that you've showed them. What would you like to hear ? Real? Fake? If someone says your amulet is fake you wouldn't be happy but if they say it's real you'd definitely be but what if you're told it's real but in fact it is actually fake?
Luangpor Kreun (Wat Sangko) Phra Sangatchai Guru of Luangpor Lum
Therefore, you should do some serious research yourself and find out as much as you can about a particular amulet that you've always been a fan of. A certified amulet is obviously better but than again who was the one who deemed the authenticity of the amulet? It is therefore always better to conclude your judgement with your own understanding so as to avoid any conflict between the seller or the judge of a competition.
Phra Luang Nang Meung collected from the Chedis of Wat Sothon(Luangpor Sothon, Cha cheongsao province)
As far as I'm concern in (My Personal Opinion) there is no fixed price for any unique or specially made amulet by a highly respected Guru. Mainly because they are limited and made for some special occasion. It probably is a one time off thing and will never be repeated again. So should you be paying so much for an amulet such as this? Again the choice is yours, you are the one who would be paying for it not anyone else. If you think it's worth buying than do it by all means. Do not compare prices with shops selling the same thing, you might most probably missed out on a lot of things that went behind your back. It may be the same amulet, same batch and from the same temple but the details might be different, if it is better looking in terms of appearance and quality it definitely commands a higher price, again there is no fixed price on the differences in quality, it's between the seller and the buyer and also the limited number of amulets that is made available.

Luangpor Sothon collected from the Chedis of Wat Sothon(Luangpor Sothon, Cha cheongsao province)
Some amulets even after they have been consecrated by the Guru gets another extra dose of mantra and sutra infusions when being specially requested, that is if you are in very good terms with the Guru. These amulets will look the same but will have that extra edge over the regulars. Some amulets made by the Gurus may never be displayed on the cabinets in the temples. These are specially made amulets that the Guru did to either give to his disciples or are prototypes. They go thru the same tedious process of consecration by the Gurus that may take months or sometimes years before they are being released.
Luangpor Lum's(Wat Samakitham) betel leaf Nampaya, very rare and unique
As everyone now knows, unscrupulous manufacturers these days go about making fake amulets and sell them as real. This is very harmful and has great detrimental effects on the faith, temple and the Guru in general. Most fake amulets are not even consecrated even though they look like the real thing. Can you tell the difference ? Unfortunately No, especially if they are modern day amulets , even antique amulets are being skillfully replicated and it takes a very well trained eye to see the difference. They came from the same source except that those handed over to the temple had been blessed while those from the manufacturer were not.
Tok Raja (Luangpor Khron) Pidta. Undeniably my favorite of all amulets
Antique amulets are different, they do not normally share to much similarities in terms of shape and conformity as they are usually hand made but the ingredients from the same batch will somewhat be the same. Amulets do not sell like hot cakes as what most people think even if they were from very famous temples or Gurus and are worth thousands of dollars. An amulet that may be worth thousands on the market may not worth a single cent to someone who knows nothing about it. Even if you were to give them with a sincere heart the recipient may just take it home and dump it into the drawer which is the usual case. The only time when they feel that the amulet is important is when they are in a dilemma or when they have accidentally place the amulet in their bag unknowingly, went off for a vacation and than met with an incident that had their life saved.
Tok Raja double sided amulet with hand written mantra
If someone gave you an amulet with sincerity, you should be grateful and feel lucky to receive it even though you know nothing. Find out a bit more about it from the person who gave it to you, he would be delighted to share everything because when a person gives something like that to you, it means that you are important to that person and he would like you to be safe at all times. Most amulets share a common thing and that is protection. Some have mixed functions like charisma, wealth luck etc but the basic intention of a good amulet is to protect the wearer. A good and powerful amulet not only protects the wearer but even anyone near it. It is hard to fathom how such things work unless you have personally experienced it yourself .
I am not an expert on amulet verification but since I was asked this question many times thats my two cents worth of opinion on the above. Please do your own research.