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聽聲音高純度黃金掉在硬地上一般會(huì)發(fā)出吧嗒聲，有聲無韻也無彈力，假的或成色低的黃金聲音脆而無沉悶感，而且落地后有余音，跳動(dòng)劇烈。</div> <div> </div> <div> 看標(biāo)記看首飾上是否印有廠家代號(hào)、“足金”等字眼(K金另說)和純度千分?jǐn)?shù)等，如果信息缺少就要提高警惕。</div> <div> </div> <div> 白銀首飾</div> <div> </div> <div> 看標(biāo)記看銀飾品上是否標(biāo)明關(guān)于純度的標(biāo)記，如S925、Ag925(時(shí)尚類多見)或S990、Ag990(傳統(tǒng)手鐲童鎖)，如果沒有需謹(jǐn)慎購買。</div> <div> </div> <div> 看顏色銀首飾的顏色多為微微帶黃的銀白色，有潤色。</div> <div> <br /> 掂重量白銀密度較一般常見金屬略大，因而掂重量可進(jìn)行初步判斷。</div> <div> <br /> 聽聲音標(biāo)準(zhǔn)銀首飾落地后聲音沉悶，無彈力。</div> <div> </div> <div> 鑒定證書</div> <div> </div> <div> 珠寶玉石鑒定證書的辨別技巧有以下幾點(diǎn)：</div> <div> </div> <div> 首先看檢驗(yàn)機(jī)構(gòu)是否合法、對(duì)珠寶玉石質(zhì)量鑒定機(jī)構(gòu)有嚴(yán)格的資格認(rèn)定，只有通過認(rèn)定，其頒發(fā)的鑒定證書才有效。珠寶玉石鑒定證書上經(jīng)常見到的有CMA、CAL、CNAS三種標(biāo)志。</div> <div> </div> <div> 其次看檢測內(nèi)容包括送檢商品的名稱、顏色、凈度、總質(zhì)量、密度、折射率等項(xiàng)目，、認(rèn)證的珠寶玉石檢測機(jī)構(gòu)對(duì)這些項(xiàng)目的檢驗(yàn)都非常嚴(yán)格。</div> <div> </div> <div> 再次看鑒定者簽名鑒定證書須兩個(gè)鑒定師簽字確認(rèn)才有效：一個(gè)是鑒定者，另一個(gè)是校核者。同時(shí)還要看、。證書上應(yīng)有鋼印，且上面的字體可以清楚辨認(rèn)。</div> <div> </div> <div> 后看編號(hào)鑒定證書背面有這個(gè)證書的編號(hào)，要與實(shí)物背面所貼的編號(hào)一致。</div> </div> <div class="6nujhg3" id="articeBottom"><a href="#">(Top) 返回頁面頂端</a></div> </div> <div style="border:1px dashed #999999"></div> <div class="6nujhg3" id="articleHeader"> <h4 style="float:left;">下一篇：<a href="http:///zwsb/70.html">辨別藥物真假的幾種實(shí)用方法</a></h4> <h4 style="float:right;text-align:right;">上一篇：<a href="http:///zwsb/64.html">如何辨別和田玉真假？</a> </h4> </div>  </div> </div> </div> <div class="6nujhg3" id="" class="" style="clear:both;"> </div>  <div id="6nujhg3" class="foot"> <div id="6nujhg3" class="foot_con"> <div id="6nujhg3" class="foot_top"> <div id="6nujhg3" class="foot_left"> <a target="_blank" href="/">首頁</a> <a target="_blank" href="http:///fwcs/">防偽常識(shí)</a> <a target="_blank" href="http:///zwsb/">真?zhèn)巫R(shí)別</a> <a target="_blank" href="http:///fwfa/">防偽方案</a> <a 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