Are lab-grown diamonds real diamonds?

Yes. Lab-grown diamonds are chemically and optically identical to natural diamonds. The only difference is their origin: lab-grown diamonds are created in controlled environments rather than mined from the earth. Both are graded by the same gemological laboratories (GIA, IGI) using the same criteria.

How much cheaper are lab-grown diamonds?

Lab-grown diamonds are currently 87% cheaper than natural diamonds on average. The average natural diamond lists at ￥955,283 JPY compared to ￥121,042 JPY for lab-grown.

Should I buy lab-grown or natural?

It depends on your priorities. Lab-grown diamonds offer significant savings, currently 87% less per carat, while natural diamonds hold their resale value better. If budget is your main concern, lab-grown gives you a larger or higher-quality stone for the same price. If long-term value matters, natural may be the better choice.

[JA] Lab-Grown vs Natural in Japan

ラボグロウンと天然ダイヤモンドの価格をシェイプ・カテゴリー別に比較。 Pricing shown in JPY.

Last updated 2026年11月2日 · Japan market view

Lab-grown diamonds are currently 87% cheaper than natural diamonds on average, with natural stones averaging $6,075 per carat compared to $770 for lab-grown. The price gap is widest for Oval diamonds at 90% and narrowest for Asscher at 82%.

[JA] Overall Comparison

天然

[JA] Avg. Price￥955,283 JPY

総掲載数16,428,139

ラボグロウン

[JA] Avg. Price￥121,042 JPY

総掲載数27,506,834

価格差

ラボグロウンの価格差87.3%

シェイプ別価格差

シェイプ別に、同等の天然石に比べて合成石がどれほど安いか。差の大きい順にソート。

Oval

90%

Pear

89%

Marquise

89%

Round

88%

Radiant

87%

Cushion

87%

Emerald

87%

Heart

87%

Princess

84%

Asscher

82%

Compare Lab vs Natural Lucyに相談

世界100社以上の小売業者の価格を比較。理想のダイヤモンドを最安値で見つけましょう。