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 81% cheaper than natural diamonds on average. The average natural diamond lists at ￥1,124,090 JPY compared to ￥208,590 JPY for lab-grown.

Should I buy lab-grown or natural?

It depends on your priorities. Lab-grown diamonds offer significant savings, currently 81% 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 31 July 2026 · Japan market view

Lab-grown diamonds are currently 81% cheaper than natural diamonds on average, with natural stones averaging $7,531 per carat compared to $1,398 for lab-grown. The price gap is widest for Marquise diamonds at 87% and narrowest for Princess at 75%.

[JA] Overall Comparison

天然

[JA] Avg. Price￥1,124,090 JPY

総掲載数9,450,568

ラボグロウン

[JA] Avg. Price￥208,590 JPY

総掲載数17,569,163

価格差

ラボグロウンの価格差81.4%

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。

Marquise

87%

Radiant

84%

Pear

84%

Cushion

83%

Emerald

82%

Heart

82%

Asscher

80%

Oval

80%

Round

75%

Princess

75%

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。