1
I have a div circular and a function that places the image inside the div.
The only thing I need is for the image to be centered on div.  
Follow the example: (Please view the excerpt in full page) 
 
	function clickImagem(src)
	{
	  $(conteudo).empty() //Ao clicar no produto, limpa todos os Charms presentes no Div Conteudo
	  document.getElementById('conteudo').style.background="url('"+src+"') no-repeat";
	}	.conteudo-externo{
		width:500px;
		height:500px;
		z-index:3;
		background:#ff1;
		float:left;
	}
	.conteudo{
		width:350px;
		height:350px;
		border-radius:50%;
		border:3px solid #000;
		z-index:5;
		background:#000;
		margin: 50px auto;
		}
		.img{
			z-index:1;
			width:130px;
                        height:130px
                        background-position:center;
			opacity:0.5;
		}<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<title>Teste</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
</head>
<body>
<img src="https://media.dooca.com.br/forfisher.com/produto/grande/pulseira-macrame-tucunare-preta-e-marrom-14534900308000.jpg" onclick="clickImagem(this.src)">
<div class="conteudo-externo">
  <div class="conteudo" id="conteudo">
   </div>
  </div>
</body>